Measles vaccine: Difference between revisions

Measles vaccine
	A child is given a measles vaccine.
Vaccine description
Target	Measles virus
Vaccine type	Attenuated
Clinical data
AHFS/Drugs.com	Monograph
MedlinePlus	a601176
ATC code	J07BD01 (WHO) ;
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Legal status	UK: POM (Prescription only); US: ℞-only;
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CAS Number	1704515-59-2 ;
ChemSpider	none;
KEGG	D04866;
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Measles vaccine protects against becoming infected with measles.^[1] Nearly all of those who do not develop immunity after a single dose develop it after a second dose.^[1] When the rate of vaccination within a population is greater than 92%, outbreaks of measles typically no longer occur; however, they may occur again if the rate of vaccination decreases.^[1] The vaccine's effectiveness lasts many years.^[1] It is unclear if it becomes less effective over time.^[1] The vaccine may also protect against measles if given within a couple of days after exposure to measles.^[2]^[1]^[3]^[4]

The vaccine is generally safe, even for those infected by HIV.^[1]^[5] Most children do not experience any side effects;^[6] those that do occur are usually mild, such as fever, rash, pain at the site of injection, and joint stiffness; and are short-lived.^[1]^[6] Anaphylaxis has been documented in about 3.5–10 cases per million doses.^[1] Rates of Guillain–Barré syndrome, autism and inflammatory bowel disease do not appear to be increased by measles vaccination.^[1]^[7]

The vaccine is available both by itself and in combinations such as the MMR vaccine (a combination with the rubella vaccine and mumps vaccine)^[1] or the MMRV vaccine (a combination of MMR with the chickenpox vaccine).^[8]^[9]^[10] The measles vaccine is equally effective for preventing measles in all formulations, but side effects vary for different combinations.^[1]^[11] The World Health Organization (WHO) recommends measles vaccine be given at nine months of age in areas of the world where the disease is common, or at twelve months where the disease is not common.^[12]^[1] Measles vaccine is based on a live but weakened strain of measles.^[1] It comes as a dried powder which is mixed with a specific liquid before being injected either just under the skin or into a muscle.^[1] Verification that the vaccine was effective can be determined by blood tests.^[1]

The measles vaccine was first introduced in 1963.^[13] In that year, the Edmonston-B strain of measles virus was turned into a vaccine by John Enders and colleagues and licensed in the United States.^[14]^[15] In 1968, an improved and even weaker measles vaccine was developed by Maurice Hilleman and colleagues, and began to be distributed, becoming the only measles vaccine used in the United States since 1968.^[16]^[14]^[15] About 86% of children globally had received at least one dose of the vaccine as of 2018.^[17] In 2021, at least 183 countries provided two doses in their routine immunization schedule.^[18] It is on the World Health Organization's List of Essential Medicines.^[19] As outbreaks easily occur in under-vaccinated populations, non-prevalence of disease is seen as a test of sufficient vaccination within a population.^[20]^[21]

Effectiveness

Measles cases 1938-1964 follow a highly variable epidemic pattern, with 150,000-850,000 cases per year. A sharp decline followed introduction of the vaccine in 1963, with fewer than 25,000 cases reported in 1968. Outbreaks around 1971 and 1977 gave 75,000 and 57,000 cases, respectively. Cases were stable at a few thousand per year until an outbreak of 28,000 in 1990. Cases declined from a few hundred per year in the early 1990s to a few dozen in the 2000s. — Measles cases reported in the United States before and after introduction of the vaccine.

Measles cases reported in Canada before and after introduction of the vaccine. Between 1959 and 1968 measles was not nationally reportable, hence there are no data are this period.

Measles cases reported in England and Wales.

One dose is about 93% effective while two doses of the vaccine are about 97% effective at preventing measles.^[5] Before the widespread use of the vaccine, measles was so common that infection was considered "as inevitable as death and taxes."^[22] In the United States, reported cases of measles fell from 3 to 4 million with 400 to 500 deaths to tens of thousands per year following introduction of two measles vaccines in 1963 (both an inactivated and a live attenuated vaccine (Edmonston B strain) were licensed for use, see chart at right).^[5]^[23] Increasing uptake of the vaccine following outbreaks in 1971 and 1977 brought this down to thousands of cases per year in the 1980s. An outbreak of almost 30,000 cases in 1990 led to a renewed push for vaccination and the addition of a second vaccine to the recommended schedule. No more than 220 cases were reported in any year from 1997 to 2013, and the disease was believed no longer endemic in the United States.^[24]^[25]^[26] In 2014, 667 cases were reported.^[27]

The benefits of measles vaccination in preventing illness, disability, and death have been well documented. Within the first 20 years of being licensed in the U.S., measles vaccination prevented an estimated 52 million cases of the disease, 17,400 cases of intellectual disability, and 5,200 deaths.^[28] From 1999 to 2004 a strategy led by the WHO and UNICEF led to improvements in measles vaccination coverage that averted an estimated 1.4 million measles deaths worldwide.^[29] The vaccine for measles led to the near-complete elimination of the disease in the United States and other developed countries.^[30] While the vaccine is made with a live virus which can cause side effects, these are far fewer and less serious than the sickness and death caused by measles itself; side effects ranging from rashes to, rarely, convulsions, occur in a small percentage of recipients.^[31]

Measles vaccination averted 57 million deaths being between 2000 and 2022, as per World Health Organization report.^[32]

Measles is common worldwide. Although it was declared eliminated from the U.S. in 2000, high rates of vaccination and excellent communication with those who refuse vaccination are needed to prevent outbreaks and sustain the elimination of measles.^[33] Of the 66 cases of measles reported in the U.S. in 2005, slightly over half were attributable to one unvaccinated teenager who became infected during a visit to Romania.^[34] This individual returned to a community with many unvaccinated children. The resulting outbreak infected 34 people, mostly children and virtually all unvaccinated; three of them were hospitalized. The public health response required making almost 5,000 phone calls as part of contact tracing, arranging and performing testing as needed, and arranging emergency vaccination for at-risk people who had had contact with this person.^[33] Taxpayers and local healthcare organizations likely paid more than US$167,000 in direct costs to contain this one outbreak.^[33] A major epidemic was averted due to high rates of vaccination in the surrounding communities.^[33]

The vaccine has non specific effects such as preventing respiratory infections, that may be greater than those of measles prevention alone.^[35] These benefits are greater when the vaccine is given before one year of age.^[36] A high-titre vaccine resulted in worse outcomes in girls, and consequently is not recommended by the World Health Organization.^[37]

The immune response to measles vaccine can be impaired by the presence of parasitic infections such as helminthiasis.^[38]

Schedule

The World Health Organization (WHO) recommends two doses of vaccine for all children.^[1] In countries with high risk of disease the first dose should be given around nine months of age.^[1] Otherwise it can be given at twelve months of age.^[1] The second dose should be given at least one month after the first dose.^[1] This is often done at age 15 to 18 months.^[1] After one dose at the age of nine months 85% are immune, while a dose at twelve months results in 95% immunity.^[13]

In the United States, the Centers for Disease Control and Prevention (CDC) recommends that children aged six to eleven months traveling outside the United States receive their first dose of MMR vaccine before departure^[39] and then receive two more doses; one at 12–15 months (12 months for children in high-risk areas) and the second as early as four weeks later.^[40] Otherwise the first dose is typically given at 12–15 months and the second at 4–6 years.^[40]

In the UK, the National Health Service (NHS) recommendation is for a first dose at around 13 months of age and the second at three years and four months old.^[41]^[42]

In Canada, Health Canada recommends that children traveling outside North America should receive an MMR vaccine if they are aged six to 12 months. However, after the child is 12 months old they should receive two additional doses to ensure long-lasting protection.^[43]

Adverse effects

Adverse effects associated with the MMR vaccine include fever, rash, injection site pain and, in rare cases, red or purple discolorations on the skin known as thrombocytopenic purpura, or seizures related to fever (febrile seizure).^[44]^[45]

Numerous studies have found no relationship between MMR vaccine and autism.^[46]^[47]^[48]^[45]

Contraindications

It is inadvisable for some people to receive the measles or MMR vaccine, including cases of:

Pregnancy: MMR vaccine and its components should not be given to pregnant women.^[49] Women of childbearing age should check with their doctor about getting vaccinated prior to getting pregnant.^[10]
HIV-infected children, who may receive measles vaccines if their CD4+ lymphocyte count is greater than 15%.^[50]
Weakened immune system due to HIV/AIDS or certain medical treatments^[10]
Having a parent or sibling with a history of immune problems^[10]
Condition that makes a patient bruise or bleed easily^[10]
Recent transfusion of blood or blood products^[10]
Tuberculosis^[10]
Receiving other vaccines in the past 4 weeks^[10]
Moderate or severe illness. However, mild illness (e.g., common cold) is usually not contraindicated.^[10]

History

Cases of measles and deaths per 100000, per year, in the United States over the 20th century

John Franklin Enders, who had shared the 1954 Nobel Prize in Medicine for work on the polio virus, sent Thomas C. Peebles to Fay School in Massachusetts, where an outbreak of measles was underway; Peebles was able to isolate the virus from blood samples and throat swabs, and was later able to cultivate the virus and show that the disease could be passed on to monkeys inoculated with the material he had collected.^[30] Enders was able to use the cultivated virus to develop a measles vaccine in 1963 by attenuation through cultured chicken embryo fibroblasts of the material isolated by Peebles.^[51]^[52]

In the late 1950s and early 1960s, nearly twice as many children died from measles as from polio.^[53] The vaccine Enders developed was based on the Edmonston strain of attenuated live measles virus, which was named for 11-year-old David Edmonston, the Fay student from whom Peebles had taken the culture that led to the virus's cultivation.^[54]

In the mid-20th century, measles was particularly devastating in West Africa, where child mortality rate was 50 percent before age five, and the children were struck with the type of rash and other symptoms common prior to 1900 in England and other countries.^{[citation needed]} The first trial of a live attenuated measles vaccine was undertaken in 1960 by the British paediatrician David Morley in a village near Ilesha, Nigeria;^[55] in case he could be accused of exploiting the Nigerian population, Morley included his own four children in the study. The encouraging results led to a second study of about 450 children in the village and at the Wesley Guild Hospital in Ilesha.^{[citation needed]}

Following another epidemic, a larger trial was undertaken in September and October 1962, in New York City with the assistance of the WHO: 131 children received the live Enders-attenuated Edmonston B strain plus gamma globulin, 130 children received a "further attenuated" vaccine without gamma globulin, and 173 children acted as control subjects for both groups. As also shown in the Nigerian trial, the trial confirmed that the "further attenuated" vaccine was superior to the Edmonston B vaccine, and caused significantly fewer instances of fever and diarrhea. 2,000 children in the area were vaccinated with the further-attenuated vaccine.^[56]^[57]

Maurice Hilleman at Merck & Co., a pioneer in the development of vaccinations, developed an improved version of the measles vaccine in 1968 and subsequently the MMR vaccine in 1971, which vaccinates against measles, mumps and rubella in a single shot followed by a booster.^[14]^[31]^[58] One form is called "Attenuvax".^[59] The measles component of the MMR vaccine uses Attenuvax,^[60] which is grown in a chick embryo cell culture using the Enders' attenuated Edmonston strain.^[60] Following ACIP recommendations, Merck decided not to resume production of Attenuvax as standalone vaccine on 21 October 2009.^[61]

A 2022 study in the American Economic Journal found that the measles vaccine uptake led to increases in income of 1.1 percent and positive effects on employment due to greater productivity by those who were vaccinated.^[62]

Types

Mumps, measles and rubella combined vaccine (MMR vaccine)

Measles is seldom given as an individual vaccine and is often given in combination with rubella, mumps, or varicella (chickenpox) vaccines.^[1] Below is the list of measles-containing vaccines:

Measles vaccine (standalone vaccine)
Measles and rubella combined vaccine (MR vaccine)
Mumps, measles and rubella combined vaccine (MMR vaccine)^[60]^[63]^[64]
Mumps, measles, rubella and varicella combined vaccine (MMRV vaccine)^[9]

Society and culture

Most health insurance plans in the United States cover the cost of vaccines, and Vaccines for Children Program may be able to help those who do not have coverage.^[65] State law requires vaccinations for school children, but offer exemptions for medical reasons and sometimes for religious or philosophical reasons.^[66] All fifty states require two doses of the MMR vaccine at the appropriate age.^[67] A different vaccine distribution within a single territory by age or social class may define different general perceptions of vaccination efficacy. ^[68]

References

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External links

"MMR (Measles, Mumps, & Rubella) Vaccine Information Statement". U.S. Centers for Disease Control and Prevention (CDC). 22 October 2019.
"MMRV (Measles, Mumps, Rubella & Varicella) Vaccine Information Statement". U.S. Centers for Disease Control and Prevention (CDC). 22 October 2019.
Measles Vaccine at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

[WHO2017Vac-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v World Health Organization (April 2017). "Measles vaccines: WHO position paper – April 2017" (PDF). Weekly Epidemiological Record. 92 (17): 205–27. hdl:10665/255377. PMID 28459148. Archived (PDF) from the original on 23 January 2023. Retrieved 23 September 2020.

[2] "Measles Vaccination and Infection: Questions and Misconceptions". ASM.org. Archived from the original on 3 April 2022. Retrieved 29 April 2022.

[who.int_2017-3] "Summary of the WHO position on Measles Vaccine- April 2017" (PDF). who.int. 20 July 2017. Archived from the original (PDF) on 8 March 2022.

[4] "Measles". www.who.int. Archived from the original on 1 June 2019. Retrieved 29 April 2022.

[CDC2020Me-5] "About Measles Vaccination | Vaccination and Immunizations | CDC". www.cdc.gov. 9 January 2020. Archived from the original on 27 April 2020. Retrieved 30 April 2020.

[CDC2020Me2-6] CDC (2 August 2019). "Measles and the Vaccine (Shot)". Centers for Disease Control and Prevention. Archived from the original on 29 January 2020. Retrieved 30 April 2020.

[7] "Measles, Mumps, and Rubella (MMR) Vaccination | CDC". www.cdc.gov. 5 April 2021. Archived from the original on 26 April 2020. Retrieved 29 April 2022.

[8] Mitchell D (2013). The essential guide to children's vaccines. New York: St. Martin's Press. p. 127. ISBN 9781466827509. Archived from the original on 8 September 2017.

[ProQuad_label-9] "ProQuad- measles, mumps, rubella and varicella virus vaccine live injection, powder, lyophilized, for suspension". DailyMed. 26 September 2019. Archived from the original on 6 April 2020. Retrieved 29 January 2020.

[www.cdc.gov_2019-10] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ "MMR Vaccination | What You Should Know | Measles, Mumps, Rubella | CDC". www.cdc.gov. 24 December 2019. Archived from the original on 26 April 2020. Retrieved 30 April 2020.

[11] "Information Sheet Observed Rate of Vaccine Reactions" (PDF). World Health Organization (WHO). Archived (PDF) from the original on 19 December 2019. Retrieved 1 December 2018.

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@@ Line 1: / Line 1: @@
 {{short description|Vaccine used to prevent measles}}
-{{Use dmy dates|date=October 2019}}
+{{Use dmy dates|date=July 2024}}
+{{cs1 config|name-list-style=vanc|display-authors=6}}
 {{Infobox drug
 | Verifiedfields = changed
@@ Line 15: / Line 16: @@
 | MedlinePlus = a601176
 | pregnancy_AU = <!-- A / B1 / B2 / B3 / C / D / X -->
-| pregnancy_US = <!-- A / B            / C / D / X -->
 | pregnancy_category =
 | legal_AU = <!-- S2, S3, S4, S5, S6, S7, S8, S9 or Unscheduled -->
@@ Line 37: / Line 37: @@
 }}
 <!-- Definition and effectiveness -->
-'''Measles vaccine''' protects against becoming infected with [[measles]].<ref name=WHO2017Vac/> Nearly all of those who do not develop immunity after a single dose develop it after a second dose.<ref name=WHO2017Vac /> When the rate of [[vaccination]] within a [[population]] is greater than 92%, [[Disease outbreak|outbreaks]] of measles typically no longer occur; however, they may occur again if the rate of vaccination decreases.<ref name=WHO2017Vac /> The [[vaccine]]'s effectiveness lasts many years.<ref name=WHO2017Vac /> It is unclear if it becomes less effective over time.<ref name=WHO2017Vac /> The vaccine may also protect against measles if given within a couple of days after exposure to measles.<ref>{{Cite web |title=Measles Vaccination and Infection: Questions and Misconceptions |url=https://asm.org/Articles/2019/July/Measles-Vaccination-and-Infection-Questions-and-Mi |access-date=2022-04-29 |website=ASM.org |language=en |archive-date=3 April 2022 |archive-url=https://web.archive.org/web/20220403061045/https://asm.org/Articles/2019/July/Measles-Vaccination-and-Infection-Questions-and-Mi |url-status=live }}</ref><ref name=WHO2017Vac>{{cite journal | vauthors = ((World Health Organization)) | author-link = World Health Organization | title = Measles vaccines: WHO position paper – April 2017 | journal = Weekly Epidemiological Record | volume = 92 | issue = 17 | pages = 205–27 | date = April 2017 | pmid = 28459148 | hdl = 10665/255377 | url = https://apps.who.int/iris/bitstream/handle/10665/255149/WER9217.pdf | access-date = 23 September 2020 | archive-date = 23 January 2023 | archive-url = https://web.archive.org/web/20230123203038/https://apps.who.int/iris/bitstream/handle/10665/255149/WER9217.pdf | url-status = live }}</ref><ref name="who.int 2017">{{cite web | title=Summary of the WHO position on Measles Vaccine- April 2017| website=who.int | date=July 20, 2017 | url=https://www.who.int/immunization/policy/position_papers/WHO_PP_measles_vaccine_summary_2017.pdf | archive-url=https://web.archive.org/web/20220308124147/https://www.who.int/immunization/policy/position_papers/WHO_PP_measles_vaccine_summary_2017.pdf | archive-date=March 8, 2022 | url-status=dead}}</ref><ref>{{Cite web |title=Measles |url=https://www.who.int/news-room/fact-sheets/detail/measles |access-date=2022-04-29 |website=www.who.int |language=en |archive-date=1 June 2019 |archive-url=https://web.archive.org/web/20190601173915/https://www.who.int/news-room/fact-sheets/detail/measles |url-status=live }}</ref>
+'''Measles vaccine''' protects against becoming infected with [[measles]].<ref name=WHO2017Vac/> Nearly all of those who do not develop immunity after a single dose develop it after a second dose.<ref name=WHO2017Vac /> When the rate of [[vaccination]] within a [[population]] is greater than 92%, [[Disease outbreak|outbreaks]] of measles typically no longer occur; however, they may occur again if the rate of vaccination decreases.<ref name=WHO2017Vac /> The [[vaccine]]'s effectiveness lasts many years.<ref name=WHO2017Vac /> It is unclear if it becomes less effective over time.<ref name=WHO2017Vac /> The vaccine may also protect against measles if given within a couple of days after exposure to measles.<ref>{{Cite web |title=Measles Vaccination and Infection: Questions and Misconceptions |url=https://asm.org/Articles/2019/July/Measles-Vaccination-and-Infection-Questions-and-Mi |access-date=29 April 2022 |website=ASM.org |language=en |archive-date=3 April 2022 |archive-url=https://web.archive.org/web/20220403061045/https://asm.org/Articles/2019/July/Measles-Vaccination-and-Infection-Questions-and-Mi |url-status=live }}</ref><ref name=WHO2017Vac>{{cite journal | vauthors = ((World Health Organization)) | author-link = World Health Organization | title = Measles vaccines: WHO position paper – April 2017 | journal = Weekly Epidemiological Record | volume = 92 | issue = 17 | pages = 205–27 | date = April 2017 | pmid = 28459148 | hdl = 10665/255377 | url = https://apps.who.int/iris/bitstream/handle/10665/255149/WER9217.pdf | access-date = 23 September 2020 | archive-date = 23 January 2023 | archive-url = https://web.archive.org/web/20230123203038/https://apps.who.int/iris/bitstream/handle/10665/255149/WER9217.pdf | url-status = live }}</ref><ref name="who.int 2017">{{cite web | title=Summary of the WHO position on Measles Vaccine- April 2017| website=who.int | date=20 July 2017 | url=https://www.who.int/immunization/policy/position_papers/WHO_PP_measles_vaccine_summary_2017.pdf | archive-url=https://web.archive.org/web/20220308124147/https://www.who.int/immunization/policy/position_papers/WHO_PP_measles_vaccine_summary_2017.pdf | archive-date=8 March 2022 | url-status=dead}}</ref><ref>{{Cite web |title=Measles |url=https://www.who.int/news-room/fact-sheets/detail/measles |access-date=29 April 2022 |website=www.who.int |language=en |archive-date=1 June 2019 |archive-url=https://web.archive.org/web/20190601173915/https://www.who.int/news-room/fact-sheets/detail/measles |url-status=live }}</ref>
 <!-- Safety -->
-The vaccine is generally safe, even for those infected by [[HIV/AIDS|HIV]].<ref name=WHO2017Vac/><ref name=CDC2020Me>{{Cite web|title=About Measles Vaccination {{!}} Vaccination and Immunizations {{!}} CDC|url=https://www.cdc.gov/vaccines/vpd/measles/index.html|date=2020-01-09|website=www.cdc.gov|language=en-us|access-date=2020-04-30|archive-date=27 April 2020|archive-url=https://web.archive.org/web/20200427170146/https://www.cdc.gov/vaccines/vpd/measles/index.html|url-status=live}}</ref> Most children do not experience any side effects;<ref name=CDC2020Me2>{{Cite web|title=Measles and the Vaccine (Shot)|url=https://www.cdc.gov/vaccines/parents/diseases/measles.html|last=CDC|date=2019-08-02|website=Centers for Disease Control and Prevention|language=en-us|access-date=2020-04-30|archive-date=29 January 2020|archive-url=https://web.archive.org/web/20200129171152/https://www.cdc.gov/vaccines/parents/diseases/measles.html|url-status=live}}</ref> those that do occur are usually mild, such as fever, rash, pain at the site of injection, and joint stiffness; and are short-lived.<ref name=WHO2017Vac /><ref name=CDC2020Me2/> [[Anaphylaxis]] has been documented in about 3.5–10 cases per million doses.<ref name=WHO2017Vac /> Rates of [[Guillain–Barré syndrome]], [[autism]] and [[inflammatory bowel disease]] do not appear to be increased by measles vaccination.<ref name=WHO2017Vac /><ref>{{Cite web |date=2021-04-05 |title=Measles, Mumps, and Rubella (MMR) Vaccination {{!}} CDC |url=https://www.cdc.gov/vaccines/vpd/mmr/public/index.html |access-date=2022-04-29 |website=www.cdc.gov |language=en-us |archive-date=26 April 2020 |archive-url=https://web.archive.org/web/20200426105545/https://www.cdc.gov/vaccines/vpd/mmr/public/index.html |url-status=live }}</ref>
+The vaccine is generally safe, even for those infected by [[HIV/AIDS|HIV]].<ref name=WHO2017Vac/><ref name=CDC2020Me>{{Cite web|title=About Measles Vaccination {{!}} Vaccination and Immunizations {{!}} CDC|url=https://www.cdc.gov/vaccines/vpd/measles/index.html|date=9 January 2020|website=www.cdc.gov|language=en-us|access-date=30 April 2020|archive-date=27 April 2020|archive-url=https://web.archive.org/web/20200427170146/https://www.cdc.gov/vaccines/vpd/measles/index.html|url-status=live}}</ref> Most children do not experience any side effects;<ref name=CDC2020Me2>{{Cite web|title=Measles and the Vaccine (Shot)|url=https://www.cdc.gov/vaccines/parents/diseases/measles.html|last=CDC|date=2 August 2019|website=Centers for Disease Control and Prevention|language=en-us|access-date=30 April 2020|archive-date=29 January 2020|archive-url=https://web.archive.org/web/20200129171152/https://www.cdc.gov/vaccines/parents/diseases/measles.html|url-status=live}}</ref> those that do occur are usually mild, such as fever, rash, pain at the site of injection, and joint stiffness; and are short-lived.<ref name=WHO2017Vac /><ref name=CDC2020Me2/> [[Anaphylaxis]] has been documented in about 3.5–10 cases per million doses.<ref name=WHO2017Vac /> Rates of [[Guillain–Barré syndrome]], [[autism]] and [[inflammatory bowel disease]] do not appear to be increased by measles vaccination.<ref name=WHO2017Vac /><ref>{{Cite web |date=5 April 2021 |title=Measles, Mumps, and Rubella (MMR) Vaccination {{!}} CDC |url=https://www.cdc.gov/vaccines/vpd/mmr/public/index.html |access-date=29 April 2022 |website=www.cdc.gov |language=en-us |archive-date=26 April 2020 |archive-url=https://web.archive.org/web/20200426105545/https://www.cdc.gov/vaccines/vpd/mmr/public/index.html |url-status=live }}</ref>
 <!-- Formulation -->
-The vaccine is available both [[Vaccine#Valence|by itself]] and in combinations such as the [[MMR vaccine]] (a combination with the [[rubella vaccine]] and [[mumps vaccine]])<ref name=WHO2017Vac /> or the [[MMRV vaccine]] (a combination of MMR with the [[varicella vaccine|chickenpox vaccine]]).<ref>{{cite book | vauthors = Mitchell D |title=The essential guide to children's vaccines |date=2013 |publisher=St. Martin's Press |location=New York |isbn=9781466827509 |page=127 |url=https://books.google.com/books?id=w0C7L9o3m-MC&pg=PA127 |url-status=live |archive-url=https://web.archive.org/web/20170908135232/https://books.google.com/books?id=w0C7L9o3m-MC&pg=PA127 |archive-date=8 September 2017}}</ref><ref name="ProQuad label">{{cite web | title=ProQuad- measles, mumps, rubella and varicella virus vaccine live injection, powder, lyophilized, for suspension | website=DailyMed | date=26 September 2019 | url=https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=73eae9fc-507b-4c9c-883d-63eb2e3cc6f6 | access-date=29 January 2020 | archive-date=6 April 2020 | archive-url=https://web.archive.org/web/20200406003810/https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=73eae9fc-507b-4c9c-883d-63eb2e3cc6f6 | url-status=live }}</ref><ref name="www.cdc.gov_2019"/> The measles vaccine is equally effective for preventing measles in all formulations, but side effects vary for different combinations.<ref name=WHO2017Vac /><ref>{{cite web |title=Information Sheet Observed Rate of Vaccine Reactions |url=https://www.who.int/vaccine_safety/initiative/tools/MMR_vaccine_rates_information_sheet.pdf?ua=1 |website=[[World Health Organization]] (WHO) |access-date=1 December 2018 |archive-date=19 December 2019 |archive-url=https://web.archive.org/web/20191219183611/https://www.who.int/vaccine_safety/initiative/tools/MMR_vaccine_rates_information_sheet.pdf?ua=1 |url-status=live }}</ref> The [[World Health Organization]] (WHO) recommends measles vaccine be given at nine months of age in areas of the world where the disease is common, or at twelve months where the disease is not common.<ref>{{Cite web |title=MEASLES VACCINE - Essential drugs |url=https://medicalguidelines.msf.org/viewport/EssDr/english/measles-vaccine-16687745.html |access-date=2022-04-28 |website=medicalguidelines.msf.org |archive-date=5 December 2021 |archive-url=https://web.archive.org/web/20211205110330/https://medicalguidelines.msf.org/viewport/EssDr/english/measles-vaccine-16687745.html |url-status=live }}</ref><ref name=WHO2017Vac /> Measles vaccine is [[Attenuated vaccine|based on a live but weakened strain]] of measles.<ref name=WHO2017Vac /> It comes as a dried powder which is mixed with a [[diluent|specific liquid]] before being injected either just under the skin or into a muscle.<ref name=WHO2017Vac /> Verification that the vaccine was effective can be determined by blood tests.<ref name=WHO2017Vac />
+The vaccine is available both [[Vaccine#Valence|by itself]] and in combinations such as the [[MMR vaccine]] (a combination with the [[rubella vaccine]] and [[mumps vaccine]])<ref name=WHO2017Vac /> or the [[MMRV vaccine]] (a combination of MMR with the [[varicella vaccine|chickenpox vaccine]]).<ref>{{cite book | vauthors = Mitchell D |title=The essential guide to children's vaccines |date=2013 |publisher=St. Martin's Press |location=New York |isbn=9781466827509 |page=127 |url=https://books.google.com/books?id=w0C7L9o3m-MC&pg=PA127 |url-status=live |archive-url=https://web.archive.org/web/20170908135232/https://books.google.com/books?id=w0C7L9o3m-MC&pg=PA127 |archive-date=8 September 2017}}</ref><ref name="ProQuad label">{{cite web | title=ProQuad- measles, mumps, rubella and varicella virus vaccine live injection, powder, lyophilized, for suspension | website=DailyMed | date=26 September 2019 | url=https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=73eae9fc-507b-4c9c-883d-63eb2e3cc6f6 | access-date=29 January 2020 | archive-date=6 April 2020 | archive-url=https://web.archive.org/web/20200406003810/https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=73eae9fc-507b-4c9c-883d-63eb2e3cc6f6 | url-status=live }}</ref><ref name="www.cdc.gov_2019"/> The measles vaccine is equally effective for preventing measles in all formulations, but side effects vary for different combinations.<ref name=WHO2017Vac /><ref>{{cite web |title=Information Sheet Observed Rate of Vaccine Reactions |url=https://www.who.int/vaccine_safety/initiative/tools/MMR_vaccine_rates_information_sheet.pdf?ua=1 |website=[[World Health Organization]] (WHO) |access-date=1 December 2018 |archive-date=19 December 2019 |archive-url=https://web.archive.org/web/20191219183611/https://www.who.int/vaccine_safety/initiative/tools/MMR_vaccine_rates_information_sheet.pdf?ua=1 |url-status=live }}</ref> The [[World Health Organization]] (WHO) recommends measles vaccine be given at nine months of age in areas of the world where the disease is common, or at twelve months where the disease is not common.<ref>{{Cite web |title=MEASLES VACCINE - Essential drugs |url=https://medicalguidelines.msf.org/viewport/EssDr/english/measles-vaccine-16687745.html |access-date=28 April 2022 |website=medicalguidelines.msf.org |archive-date=5 December 2021 |archive-url=https://web.archive.org/web/20211205110330/https://medicalguidelines.msf.org/viewport/EssDr/english/measles-vaccine-16687745.html |url-status=live }}</ref><ref name=WHO2017Vac /> Measles vaccine is [[Attenuated vaccine|based on a live but weakened strain]] of measles.<ref name=WHO2017Vac /> It comes as a dried powder which is mixed with a [[diluent|specific liquid]] before being injected either just under the skin or into a muscle.<ref name=WHO2017Vac /> Verification that the vaccine was effective can be determined by blood tests.<ref name=WHO2017Vac />
 <!-- Usage, history, society and culture -->
-The measles vaccine was first introduced in 1963.<ref name="Yellow2014">{{cite book|author=Centers for Disease Control and Prevention|url=https://books.google.com/books?id=nVppAgAAQBAJ&pg=PA250|title=CDC health information for international travel 2014 the yellow book|date=2014|isbn=9780199948505|page=250| publisher=Oxford University Press |archive-url=https://web.archive.org/web/20170908135232/https://books.google.com/books?id=nVppAgAAQBAJ&pg=PA250|archive-date=8 September 2017|url-status=live}}</ref> In that year, the Edmonston-B strain of measles virus was turned into a vaccine by [[John Enders]] and colleagues and licensed in the United States.<ref name="CDC_2020">{{Cite web|last=CDC|date=2020-11-05|title=History of Measles|url=https://www.cdc.gov/measles/about/history.html|access-date=2021-02-09|website=Centers for Disease Control and Prevention|language=en-us|archive-date=6 April 2020|archive-url=https://web.archive.org/web/20200406003814/https://www.cdc.gov/measles/about/history.html|url-status=live}}</ref><ref name=CDC2018Hist/> In 1968, an improved and even weaker measles vaccine was developed by [[Maurice Hilleman]] and colleagues, and began to be distributed, becoming the only measles vaccine used in the United States since 1968.<ref>{{Cite web |work=The Children's Hospital of Philadelphia |date=2014-11-20 |title=Vaccine History: Developments by Year |url=https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year |access-date=2022-04-28 |archive-date=28 April 2022 |archive-url=https://web.archive.org/web/20220428154721/https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year |url-status=live }}</ref><ref name="CDC_2020" /><ref name=CDC2018Hist>{{cite web | title=Measles History | website=U.S. [[Centers for Disease Control and Prevention]] (CDC) | date=5 February 2018 | url=https://www.cdc.gov/measles/about/history.html | access-date=28 January 2020 | archive-date=6 April 2020 | archive-url=https://web.archive.org/web/20200406003814/https://www.cdc.gov/measles/about/history.html | url-status=live }} {{PD-notice}}</ref> About 86% of children globally had received at least one dose of the vaccine as of 2018.<ref name="WHO-factsheet">{{Cite web |date=20 March 2023 |title=Measles Fact Sheet - WHO |url=https://www.who.int/en/news-room/fact-sheets/detail/measles |access-date=2023-05-29 |website=[[World Health Organization]] (WHO) |archive-date=28 November 2022 |archive-url=https://web.archive.org/web/20221128010546/https://www.who.int/en/news-room/fact-sheets/detail/measles |url-status=live }}</ref> In 2021, at least 183 countries provided two doses in their routine immunization schedule.<ref>{{Cite web |date=14 July 2022 |title=Immunization Coverage - WHO |url=https://www.who.int/en/news-room/fact-sheets/detail/immunization-coverage |access-date=2023-05-29 |website=[[World Health Organization]] (WHO) |archive-date=6 February 2018 |archive-url=https://web.archive.org/web/20180206064744/http://www.who.int/mediacentre/factsheets/fs378/en/ |url-status=live }}</ref> It is on the [[WHO Model List of Essential Medicines|World Health Organization's List of Essential Medicines]].<ref name="WHO21st">{{cite book | vauthors = ((World Health Organization)) | title = World Health Organization model list of essential medicines: 21st list 2019 | year = 2019 | hdl = 10665/325771 | author-link = World Health Organization | publisher = World Health Organization | location = Geneva | id = WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO | hdl-access=free }}</ref> As outbreaks easily occur in under-vaccinated populations, non-prevalence of disease is seen as a test of sufficient vaccination within a population.<ref>{{Cite web |title=Measles |url=https://www.who.int/news-room/fact-sheets/detail/measles |access-date=2022-04-28 |website=www.who.int |language=en |archive-date=1 June 2019 |archive-url=https://web.archive.org/web/20190601173915/https://www.who.int/news-room/fact-sheets/detail/measles |url-status=live }}</ref><ref>{{cite book | vauthors = Abramson B |title=Vaccine, vaccination, and immunization law |date=2018 |publisher=Bloomberg Law |isbn=9781682675830 |pages=10–30}}</ref>
+The measles vaccine was first introduced in 1963.<ref name="Yellow2014">{{cite book|author=Centers for Disease Control and Prevention|url=https://books.google.com/books?id=nVppAgAAQBAJ&pg=PA250|title=CDC health information for international travel 2014 the yellow book|date=2014|isbn=9780199948505|page=250| publisher=Oxford University Press |archive-url=https://web.archive.org/web/20170908135232/https://books.google.com/books?id=nVppAgAAQBAJ&pg=PA250|archive-date=8 September 2017|url-status=live}}</ref> In that year, the Edmonston-B strain of measles virus was turned into a vaccine by [[John Enders]] and colleagues and licensed in the United States.<ref name="CDC_2020">{{Cite web|last=CDC|date=5 November 2020|title=History of Measles|url=https://www.cdc.gov/measles/about/history.html|access-date=9 February 2021|website=Centers for Disease Control and Prevention|language=en-us|archive-date=6 April 2020|archive-url=https://web.archive.org/web/20200406003814/https://www.cdc.gov/measles/about/history.html|url-status=live}}</ref><ref name=CDC2018Hist/> In 1968, an improved and even weaker measles vaccine was developed by [[Maurice Hilleman]] and colleagues, and began to be distributed, becoming the only measles vaccine used in the United States since 1968.<ref>{{Cite web |work=The Children's Hospital of Philadelphia |date=20 November 2014 |title=Vaccine History: Developments by Year |url=https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year |access-date=28 April 2022 |archive-date=28 April 2022 |archive-url=https://web.archive.org/web/20220428154721/https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-history/developments-by-year |url-status=live }}</ref><ref name="CDC_2020" /><ref name=CDC2018Hist>{{cite web | title=Measles History | website=U.S. [[Centers for Disease Control and Prevention]] (CDC) | date=5 February 2018 | url=https://www.cdc.gov/measles/about/history.html | access-date=28 January 2020 | archive-date=6 April 2020 | archive-url=https://web.archive.org/web/20200406003814/https://www.cdc.gov/measles/about/history.html | url-status=live }} {{PD-notice}}</ref> About 86% of children globally had received at least one dose of the vaccine as of 2018.<ref name="WHO-factsheet">{{Cite web |date=20 March 2023 |title=Measles Fact Sheet - WHO |url=https://www.who.int/en/news-room/fact-sheets/detail/measles |access-date=29 May 2023 |website=[[World Health Organization]] (WHO) |archive-date=28 November 2022 |archive-url=https://web.archive.org/web/20221128010546/https://www.who.int/en/news-room/fact-sheets/detail/measles |url-status=live }}</ref> In 2021, at least 183 countries provided two doses in their routine immunization schedule.<ref>{{Cite web |date=14 July 2022 |title=Immunization Coverage - WHO |url=https://www.who.int/en/news-room/fact-sheets/detail/immunization-coverage |access-date=29 May 2023 |website=[[World Health Organization]] (WHO) |archive-date=6 February 2018 |archive-url=https://web.archive.org/web/20180206064744/http://www.who.int/mediacentre/factsheets/fs378/en/ |url-status=live }}</ref> It is on the [[WHO Model List of Essential Medicines|World Health Organization's List of Essential Medicines]].<ref name="WHO23rd">{{cite book | vauthors = ((World Health Organization)) | title = The selection and use of essential medicines 2023: web annex A: World Health Organization model list of essential medicines: 23rd list (2023) | year = 2023 | hdl = 10665/371090 | author-link = World Health Organization | publisher = World Health Organization | location = Geneva | id = WHO/MHP/HPS/EML/2023.02 | hdl-access=free }}</ref> As outbreaks easily occur in under-vaccinated populations, non-prevalence of disease is seen as a test of sufficient vaccination within a population.<ref>{{Cite web |title=Measles |url=https://www.who.int/news-room/fact-sheets/detail/measles |access-date=28 April 2022 |website=www.who.int |language=en |archive-date=1 June 2019 |archive-url=https://web.archive.org/web/20190601173915/https://www.who.int/news-room/fact-sheets/detail/measles |url-status=live }}</ref><ref>{{cite book | vauthors = Abramson B |title=Vaccine, vaccination, and immunization law |date=2018 |publisher=Bloomberg Law |isbn=9781682675830 |pages=10–30}}</ref>
 ==Effectiveness==
@@ Line 53: / Line 53: @@
 [[File:Measles incidence England&Wales 1940-2007.png|upright=1.3|thumb|Measles cases reported in England and [[Wales]].]]
-One dose is about 93% effective while two doses of the vaccine are about 97% effective at preventing measles.<ref name=CDC2020Me/> Before the widespread use of the vaccine, measles was so common that infection was considered "as inevitable as death and taxes."<ref>{{cite journal | vauthors = Babbott FL, Gordon JE | title = Modern measles | journal = The American Journal of the Medical Sciences | volume = 228 | issue = 3 | pages = 334–61 | date = September 1954 | pmid = 13197385 | doi = 10.1097/00000441-195409000-00013 }}</ref> In the United States, reported cases of measles fell from 3 to 4 million with 400 to 500 deaths to tens of thousands per year following introduction of two measles vaccines in 1963 (both an inactivated and a live [[attenuated vaccine]] (Edmonston B strain) were licensed for use, see chart at right).<ref name=CDC2020Me /><ref>{{Cite web|url=https://www.cdc.gov/mmwr/preview/mmwrhtml/00041753.htm|title=Measles Prevention: Recommendations of the Immunization Practices Advisory Committee (ACIP)|website=www.cdc.gov|access-date=2020-04-27|archive-date=15 May 2012|archive-url=https://web.archive.org/web/20120515055632/http://www.cdc.gov/mmwr/preview/mmwrhtml/00041753.htm|url-status=live}}</ref> Increasing uptake of the vaccine following outbreaks in 1971 and 1977 brought this down to thousands of cases per year in the 1980s. An outbreak of almost 30,000 cases in 1990 led to a renewed push for vaccination and the addition of a second vaccine to the recommended schedule. No more than 220 cases were reported in any year from 1997 to 2013, and the disease was believed no longer [[Endemic (epidemiology)|endemic]] in the United States.<ref name="pmid9247368">{{cite journal | author = Centers for Disease Control and Prevention (CDC) | title = Summary of notifiable diseases, United States, 1993 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 42 | issue = 53 | pages = i–xvii; 1–73 | date = 1994 | pmid = 9247368 | url = http://www.cdc.gov/mmwr/preview/mmwrhtml/00035381.htm | archive-url = https://web.archive.org/web/20100309075517/http://www.cdc.gov/mmwr/preview/mmwrhtml/00035381.htm | archive-date = 9 March 2010 }}</ref><ref>{{cite journal | author = Centers for Disease Control and Prevention (CDC) | title = Summary of notifiable diseases, United States, 2007 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 56 | issue = 53 | pages = 1–94 | date = July 2007 | url = https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5653a1.htm | access-date = 10 September 2017 | archive-date = 13 June 2018 | archive-url = https://web.archive.org/web/20180613234236/https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5653a1.htm | url-status = live }}</ref><ref>{{cite book | vauthors = Wallace G, Leroy Z | chapter = Measles | veditors = Hamborsky J, Kroger A, Wolfe S | title = Epidemiology and Prevention of Vaccine-Preventable Diseases | edition = 13th | year = 2015 | chapter-url = https://www.cdc.gov/vaccines/pubs/pinkbook/meas.html | location = Washington D.C. | publisher = Public Health Foundation | access-date = 30 April 2019 | archive-date = 7 February 2015 | archive-url = https://web.archive.org/web/20150207061223/http://www.cdc.gov/vaccines/pubs/pinkbook/meas.html | url-status = live }}</ref> In 2014, 667 cases were reported.<ref>{{cite web |url=https://www.cdc.gov/measles/cases-outbreaks.html |title=Measles Cases and Outbreaks |access-date=30 November 2018 |url-status=live |archive-url=https://web.archive.org/web/20150213145736/http://www.cdc.gov/measles/cases-outbreaks.html |archive-date=13 February 2015}}</ref>
+One dose is about 93% effective while two doses of the vaccine are about 97% effective at preventing measles.<ref name=CDC2020Me/> Before the widespread use of the vaccine, measles was so common that infection was considered "as inevitable as death and taxes."<ref>{{cite journal | vauthors = Babbott FL, Gordon JE | title = Modern measles | journal = The American Journal of the Medical Sciences | volume = 228 | issue = 3 | pages = 334–61 | date = September 1954 | pmid = 13197385 | doi = 10.1097/00000441-195409000-00013 }}</ref> In the United States, reported cases of measles fell from 3 to 4 million with 400 to 500 deaths to tens of thousands per year following introduction of two measles vaccines in 1963 (both an inactivated and a live [[attenuated vaccine]] (Edmonston B strain) were licensed for use, see chart at right).<ref name=CDC2020Me /><ref>{{Cite web|url=https://www.cdc.gov/mmwr/preview/mmwrhtml/00041753.htm|title=Measles Prevention: Recommendations of the Immunization Practices Advisory Committee (ACIP)|website=www.cdc.gov|access-date=27 April 2020|archive-date=15 May 2012|archive-url=https://web.archive.org/web/20120515055632/http://www.cdc.gov/mmwr/preview/mmwrhtml/00041753.htm|url-status=live}}</ref> Increasing uptake of the vaccine following outbreaks in 1971 and 1977 brought this down to thousands of cases per year in the 1980s. An outbreak of almost 30,000 cases in 1990 led to a renewed push for vaccination and the addition of a second vaccine to the recommended schedule. No more than 220 cases were reported in any year from 1997 to 2013, and the disease was believed no longer [[Endemic (epidemiology)|endemic]] in the United States.<ref name="pmid9247368">{{cite journal | author = Centers for Disease Control and Prevention (CDC) | title = Summary of notifiable diseases, United States, 1993 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 42 | issue = 53 | pages = i–xvii; 1–73 | date = 1994 | pmid = 9247368 | url = http://www.cdc.gov/mmwr/preview/mmwrhtml/00035381.htm | archive-url = https://web.archive.org/web/20100309075517/http://www.cdc.gov/mmwr/preview/mmwrhtml/00035381.htm | archive-date = 9 March 2010 }}</ref><ref>{{cite journal | author = Centers for Disease Control and Prevention (CDC) | title = Summary of notifiable diseases, United States, 2007 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 56 | issue = 53 | pages = 1–94 | date = July 2007 | url = https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5653a1.htm | access-date = 10 September 2017 | archive-date = 13 June 2018 | archive-url = https://web.archive.org/web/20180613234236/https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5653a1.htm | url-status = live }}</ref><ref>{{cite book | vauthors = Wallace G, Leroy Z | chapter = Measles | veditors = Hamborsky J, Kroger A, Wolfe S | title = Epidemiology and Prevention of Vaccine-Preventable Diseases | edition = 13th | year = 2015 | chapter-url = https://www.cdc.gov/vaccines/pubs/pinkbook/meas.html | location = Washington D.C. | publisher = Public Health Foundation | access-date = 30 April 2019 | archive-date = 7 February 2015 | archive-url = https://web.archive.org/web/20150207061223/http://www.cdc.gov/vaccines/pubs/pinkbook/meas.html | url-status = live }}</ref> In 2014, 667 cases were reported.<ref>{{cite web |url=https://www.cdc.gov/measles/cases-outbreaks.html |title=Measles Cases and Outbreaks |access-date=30 November 2018 |url-status=live |archive-url=https://web.archive.org/web/20150213145736/http://www.cdc.gov/measles/cases-outbreaks.html |archive-date=13 February 2015}}</ref>
 The benefits of measles vaccination in preventing illness, disability, and death have been well documented. Within the first 20 years of being licensed in the U.S., measles vaccination prevented an estimated 52 million cases of the disease, 17,400 cases of [[intellectual disability]], and 5,200 deaths.<ref>{{cite journal | vauthors = Bloch AB, Orenstein WA, Stetler HC, Wassilak SG, Amler RW, Bart KJ, Kirby CD, Hinman AR | title = Health impact of measles vaccination in the United States | journal = Pediatrics | volume = 76 | issue = 4 | pages = 524–32 | date = October 1985 | doi = 10.1542/peds.76.4.524 | pmid = 3931045 | s2cid = 6512947 }}</ref> From 1999 to 2004 a strategy led by the WHO and [[UNICEF]] led to improvements in measles vaccination coverage that averted an estimated 1.4 million measles deaths worldwide.<ref>{{cite journal | author = Centers for Disease Control and Prevention (CDC) | title = Progress in reducing global measles deaths, 1999-2004 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 55 | issue = 9 | pages = 247–9 | date = March 2006 | pmid = 16528234 | url = https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5509a8.htm | archive-url = https://web.archive.org/web/20071016143014/http://cdc.gov/mmwr/preview/mmwrhtml/mm5509a8.htm | url-status = live | archive-date = 16 October 2007 }}</ref> The vaccine for measles led to the near-complete elimination of the disease in the United States and other developed countries.<ref name=NYTPeebles/> While the vaccine is made with a live virus which can cause side effects, these are far fewer and less serious than the sickness and death caused by measles itself; side effects ranging from rashes to, rarely, [[convulsion]]s, occur in a small percentage of recipients.<ref name=PI>{{cite news | vauthors = Collins H | title = The Man Who Saved Your Life - Maurice R. Hilleman - Developer of Vaccines for Mumps and Pandemic Flu | url=http://www.njabr.org/njsor/science_superstars/maurice_hilleman/ | archive-url=https://web.archive.org/web/20090306224906/http://www.njabr.org/njsor/science_superstars/maurice_hilleman/ | archive-date=6 March 2009 | url-status=dead | work = [[The Philadelphia Inquirer]] | date = 30 August 1999 | access-date=28 January 2020 }}</ref>
+Measles vaccination averted 57 million deaths being between 2000 and 2022, as per [[World Health Organization]] report.<ref>{{Cite web |title=Measles |url=https://www.who.int/news-room/fact-sheets/detail/measles |access-date=2024-08-21 |website=www.who.int |language=en}}</ref>
 Measles is [[Endemic (epidemiology)|common]] worldwide. Although it was declared eliminated from the U.S. in 2000, high rates of vaccination and excellent communication with those who refuse vaccination are needed to prevent outbreaks and sustain the elimination of measles.<ref name=Parker/> Of the 66 cases of measles reported in the U.S. in 2005, slightly over half were attributable to one unvaccinated teenager who became infected during a visit to Romania.<ref>{{cite journal | author = Centers for Disease Control and Prevention (CDC) | title = Measles--United States, 2005 | journal = MMWR. Morbidity and Mortality Weekly Report | volume = 55 | issue = 50 | pages = 1348–51 | date = December 2006 | pmid = 17183226 | url = https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5550a2.htm | archive-url = https://web.archive.org/web/20150313120119/http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5550a2.htm | url-status = live | archive-date = 13 March 2015 }}</ref> This individual returned to a community with many unvaccinated children. The resulting outbreak infected 34 people, mostly children and virtually all unvaccinated; three of them were hospitalized. The public health response required making almost 5,000 phone calls as part of [[contact tracing]], arranging and performing testing as needed, and arranging emergency vaccination for at-risk people who had had contact with this person.<ref name="Parker" />  Taxpayers and local healthcare organizations likely paid more than US$167,000 in direct costs to contain this one outbreak.<ref name="Parker" /> A major [[epidemic]] was averted due to high rates of vaccination in the surrounding communities.<ref name=Parker>{{cite journal | vauthors = Parker AA, Staggs W, Dayan GH, Ortega-Sánchez IR, Rota PA, Lowe L, Boardman P, Teclaw R, Graves C, LeBaron CW | title = Implications of a 2005 measles outbreak in Indiana for sustained elimination of measles in the United States | journal = The New England Journal of Medicine | volume = 355 | issue = 5 | pages = 447–55 | date = August 2006 | pmid = 16885548 | doi = 10.1056/NEJMoa060775 | doi-access = free }}</ref>
-The vaccine has [[non-specific effect of vaccines|non specific effects]] such as preventing respiratory infections, that may be greater than those of measles prevention alone.<ref>{{cite journal | vauthors = Mina MJ | title = Measles, immune suppression and vaccination: direct and indirect nonspecific vaccine benefits | journal = The Journal of Infection | volume = 74 | issue = Suppl 1 | pages = S10–S17 | date = June 2017 | pmid = 28646947 | doi = 10.1016/S0163-4453(17)30185-8 }}</ref><!-- <ref name=Sankoh2014/> --> These benefits are greater when the vaccine is given before one year of age.<ref>{{cite journal | vauthors = Nic Lochlainn LM, de Gier B, van der Maas N, van Binnendijk R, Strebel PM, Goodman T, de Melker HE, Moss WJ, Hahné SJ | display-authors = 6 | title = Effect of measles vaccination in infants younger than 9 months on the immune response to subsequent measles vaccine doses: a systematic review and meta-analysis | language = English | journal = The Lancet. Infectious Diseases | volume = 19 | issue = 11 | pages = 1246–1254 | date = November 2019 | pmid = 31548081 | pmc = 6838663 | doi = 10.1016/S1473-3099(19)30396-2 }}</ref><!-- <ref name=Sankoh2014/> --> A high-[[Antibody titer|titre]] vaccine resulted in worse outcomes in girls, and consequently is not recommended by the World Health Organization.<ref name=Sankoh2014>{{cite journal | vauthors = Sankoh O, Welaga P, Debpuur C, Zandoh C, Gyaase S, Poma MA, Mutua MK, Hanifi SM, Martins C, Nebie E, Kagoné M, Emina JB, Aaby P | display-authors = 6 | title = The non-specific effects of vaccines and other childhood interventions: the contribution of INDEPTH Health and Demographic Surveillance Systems | journal = International Journal of Epidemiology | volume = 43 | issue = 3 | pages = 645–653 | date = June 2014 | pmid = 24920644 | pmc = 4052142 | doi = 10.1093/ije/dyu101 }}</ref>
+The vaccine has [[non-specific effect of vaccines|non specific effects]] such as preventing respiratory infections, that may be greater than those of measles prevention alone.<ref>{{cite journal | vauthors = Mina MJ | title = Measles, immune suppression and vaccination: direct and indirect nonspecific vaccine benefits | journal = The Journal of Infection | volume = 74 | issue = Suppl 1 | pages = S10–S17 | date = June 2017 | pmid = 28646947 | doi = 10.1016/S0163-4453(17)30185-8 }}</ref><!-- <ref name=Sankoh2014/> --> These benefits are greater when the vaccine is given before one year of age.<ref>{{cite journal | vauthors = Nic Lochlainn LM, de Gier B, van der Maas N, van Binnendijk R, Strebel PM, Goodman T, de Melker HE, Moss WJ, Hahné SJ | title = Effect of measles vaccination in infants younger than 9 months on the immune response to subsequent measles vaccine doses: a systematic review and meta-analysis | language = English | journal = The Lancet. Infectious Diseases | volume = 19 | issue = 11 | pages = 1246–1254 | date = November 2019 | pmid = 31548081 | pmc = 6838663 | doi = 10.1016/S1473-3099(19)30396-2 }}</ref><!-- <ref name=Sankoh2014/> --> A high-[[Antibody titer|titre]] vaccine resulted in worse outcomes in girls, and consequently is not recommended by the World Health Organization.<ref name=Sankoh2014>{{cite journal | vauthors = Sankoh O, Welaga P, Debpuur C, Zandoh C, Gyaase S, Poma MA, Mutua MK, Hanifi SM, Martins C, Nebie E, Kagoné M, Emina JB, Aaby P | title = The non-specific effects of vaccines and other childhood interventions: the contribution of INDEPTH Health and Demographic Surveillance Systems | journal = International Journal of Epidemiology | volume = 43 | issue = 3 | pages = 645–653 | date = June 2014 | pmid = 24920644 | pmc = 4052142 | doi = 10.1093/ije/dyu101 }}</ref>
+The immune response to measles vaccine can be impaired by the presence of parasitic infections such as [[helminthiasis]].<ref>{{cite journal | vauthors = Natukunda A, Zirimenya L, Nassuuna J, Nkurunungi G, Cose S, Elliott AM, Webb EL | title = The effect of helminth infection on vaccine responses in humans and animal models: A systematic review and meta-analysis | journal = Parasite Immunology | volume = 44 | issue = 9 | pages = e12939 | date = September 2022 | pmid = 35712983 | pmc = 9542036 | doi = 10.1111/pim.12939 }}</ref>
 ===Schedule===
@@ Line 73: / Line 77: @@
 Adverse effects associated with the MMR vaccine include [[fever]], rash, injection site pain and, in rare cases, red or purple discolorations on the skin known as [[thrombocytopenic purpura]], or seizures related to fever ([[febrile seizure]]).<ref>{{cite web | title = Information Sheet: Observed Rate of Vaccine Reactions: Measles, Mumps and Rubella Vaccines | url = https://www.who.int/vaccine_safety/initiative/tools/MMR_vaccine_rates_information_sheet.pdf | publisher = [[World Health Organization]] (WHO) | date = May 2014 | access-date = 1 December 2018 | archive-date = 17 December 2019 | archive-url = https://web.archive.org/web/20191217095809/https://www.who.int/vaccine_safety/initiative/tools/MMR_vaccine_rates_information_sheet.pdf | url-status = live }}</ref><ref name="Di Pietrantonj_2021">{{cite journal | vauthors = Di Pietrantonj C, Rivetti A, Marchione P, Debalini MG, Demicheli V | title = Vaccines for measles, mumps, rubella, and varicella in children | journal = The Cochrane Database of Systematic Reviews | volume = 2021 | issue = 11 | pages = CD004407 | date = November 2021 | pmid = 34806766 | pmc = 8607336 | doi = 10.1002/14651858.CD004407.pub5 }}</ref>
-Numerous studies have found no relationship between [[MMR vaccine and autism]].<ref>{{cite book | chapter = Measles, Mumps, and Rubella Vaccine | title = Adverse Effects of Vaccines: Evidence and Causality | chapter-url = https://www.nap.edu/read/13164/chapter/6#152 | location = Washington, D.C. | publisher = The National Academies Press | isbn = 978-0-309-21436-0 | date = 2012-04-09 | doi = 10.17226/13164 | pmid = 24624471 | access-date = 3 November 2017 | archive-date = 7 November 2017 | archive-url = https://web.archive.org/web/20171107020850/https://www.nap.edu/read/13164/chapter/6#152 | url-status = live | collaboration = Committee to Review Adverse Effects of Vaccines | vauthors = Stratton K, Ford A, Rusch E, Clayton EW }}</ref><ref>{{cite web |url= http://cdc.gov/vaccinesafety/concerns/mmr_autism_factsheet.htm |title= Measles, mumps, and rubella (MMR) vaccine |date=22 August 2008 |access-date=21 December 2008 |publisher= Centers for Disease Control and Prevention |archive-url= https://web.archive.org/web/20081008040738/http://www.cdc.gov/vaccinesafety/concerns/mmr_autism_factsheet.htm |archive-date=8 October 2008}}</ref><ref>{{cite book | title = Immunization Safety Review: Vaccines and Autism | url = https://www.nap.edu/catalog/10997/immunization-safety-review-vaccines-and-autism | publisher = Institute of Medicine of the National Academy of Sciences | date = 17 May 2004 | isbn = 978-0-309-09237-1 | doi = 10.17226/10997 | pmid = 20669467 | author1 = Institute of Medicine (US) Immunization Safety Review Committee | access-date = 19 October 2019 | archive-date = 7 October 2014 | archive-url = https://web.archive.org/web/20141007075952/http://www.nap.edu/catalog.php?record_id=10997 | url-status = live }}</ref><ref name="Di Pietrantonj_2021" />
+Numerous studies have found no relationship between [[MMR vaccine and autism]].<ref>{{cite book | chapter = Measles, Mumps, and Rubella Vaccine | title = Adverse Effects of Vaccines: Evidence and Causality | chapter-url = https://www.nap.edu/read/13164/chapter/6#152 | location = Washington, D.C. | publisher = The National Academies Press | isbn = 978-0-309-21436-0 | date = 9 April 2012 | doi = 10.17226/13164 | pmid = 24624471 | access-date = 3 November 2017 | archive-date = 7 November 2017 | archive-url = https://web.archive.org/web/20171107020850/https://www.nap.edu/read/13164/chapter/6#152 | url-status = live | collaboration = Committee to Review Adverse Effects of Vaccines | vauthors = Stratton K, Ford A, Rusch E, Clayton EW }}</ref><ref>{{cite web |url= http://cdc.gov/vaccinesafety/concerns/mmr_autism_factsheet.htm |title= Measles, mumps, and rubella (MMR) vaccine |date=22 August 2008 |access-date=21 December 2008 |publisher= Centers for Disease Control and Prevention |archive-url= https://web.archive.org/web/20081008040738/http://www.cdc.gov/vaccinesafety/concerns/mmr_autism_factsheet.htm |archive-date=8 October 2008}}</ref><ref>{{cite book | title = Immunization Safety Review: Vaccines and Autism | url = https://www.nap.edu/catalog/10997/immunization-safety-review-vaccines-and-autism | publisher = Institute of Medicine of the National Academy of Sciences | date = 17 May 2004 | isbn = 978-0-309-09237-1 | doi = 10.17226/10997 | pmid = 20669467 | author1 = Institute of Medicine (US) Immunization Safety Review Committee | access-date = 19 October 2019 | archive-date = 7 October 2014 | archive-url = https://web.archive.org/web/20141007075952/http://www.nap.edu/catalog.php?record_id=10997 | url-status = live }}</ref><ref name="Di Pietrantonj_2021" />
 ===Contraindications===
 It is inadvisable for some people to receive the measles or MMR vaccine, including cases of:
-* Pregnancy: MMR vaccine and its components should not be given to pregnant women.<ref>{{cite web | url = https://www.cdc.gov/vaccines/pregnancy/hcp-toolkit/guidelines.html | title = Guidelines for Vaccinating Pregnant Women | date = August 2016 | work = Centers for Disease Control and Prevention | access-date = 30 April 2019 | archive-date = 6 April 2020 | archive-url = https://web.archive.org/web/20200406003822/https://www.cdc.gov/vaccines/pregnancy/hcp-toolkit/guidelines.html | url-status = live }}</ref> Women of childbearing age should check with their doctor about getting vaccinated prior to getting pregnant.<ref name="www.cdc.gov_2019">{{Cite web|title=MMR Vaccination {{!}} What You Should Know {{!}} Measles, Mumps, Rubella {{!}} CDC|url=https://www.cdc.gov/vaccines/vpd/mmr/public/index.html|date=2019-12-24|website=www.cdc.gov|language=en-us|access-date=2020-04-30|archive-date=26 April 2020|archive-url=https://web.archive.org/web/20200426105545/https://www.cdc.gov/vaccines/vpd/mmr/public/index.html|url-status=live}}</ref>
+* Pregnancy: MMR vaccine and its components should not be given to pregnant women.<ref>{{cite web | url = https://www.cdc.gov/vaccines/pregnancy/hcp-toolkit/guidelines.html | title = Guidelines for Vaccinating Pregnant Women | date = August 2016 | work = Centers for Disease Control and Prevention | access-date = 30 April 2019 | archive-date = 6 April 2020 | archive-url = https://web.archive.org/web/20200406003822/https://www.cdc.gov/vaccines/pregnancy/hcp-toolkit/guidelines.html | url-status = live }}</ref> Women of childbearing age should check with their doctor about getting vaccinated prior to getting pregnant.<ref name="www.cdc.gov_2019">{{Cite web|title=MMR Vaccination {{!}} What You Should Know {{!}} Measles, Mumps, Rubella {{!}} CDC|url=https://www.cdc.gov/vaccines/vpd/mmr/public/index.html|date=24 December 2019|website=www.cdc.gov|language=en-us|access-date=30 April 2020|archive-date=26 April 2020|archive-url=https://web.archive.org/web/20200426105545/https://www.cdc.gov/vaccines/vpd/mmr/public/index.html|url-status=live}}</ref>
-* HIV-infected children, who may receive measles vaccines if their [[CD4+]] lymphocyte count is greater than 15%.<ref>{{cite book | chapter = Contraindications and Precautions | title = Vaccine Recommendations and Guidelines of the ACIP | chapter-url = https://www.cdc.gov/vaccines/hcp/acip-recs/general-recs/contraindications.html | work = Centers for Disease Control and Prevention | date = 23 April 2020 | access-date = 30 April 2019 | archive-date = 1 May 2019 | archive-url = https://web.archive.org/web/20190501034917/https://www.cdc.gov/vaccines/hcp/acip-recs/general-recs/contraindications.html | url-status = live }}</ref>
+* HIV-infected children, who may receive measles vaccines if their [[CD4+]] lymphocyte count is greater than 15%.<ref>{{cite book | chapter = Contraindications and Precautions | title = Vaccine Recommendations and Guidelines of the ACIP | chapter-url = https://www.cdc.gov/vaccines/hcp/acip-recs/general-recs/contraindications.html | publisher = Centers for Disease Control and Prevention | date = 23 April 2020 | access-date = 30 April 2019 | archive-date = 1 May 2019 | archive-url = https://web.archive.org/web/20190501034917/https://www.cdc.gov/vaccines/hcp/acip-recs/general-recs/contraindications.html | url-status = live }}</ref>
 * Weakened immune system due to HIV/AIDS or certain medical treatments<ref name="www.cdc.gov_2019"/>
 * Having a parent or sibling with a history of immune problems<ref name="www.cdc.gov_2019" />
@@ Line 95: / Line 99: @@
 In the late 1950s and early 1960s, nearly twice as many children died from measles as from polio.<ref>{{cite web | title = The Measles Vaccine | url = https://www.nytimes.com/1963/03/28/archives/the-measles-vaccine.html | work = The New York Times | date = 28 March 1963 | access-date = 30 April 2019 | archive-date = 30 April 2019 | archive-url = https://web.archive.org/web/20190430074633/https://www.nytimes.com/1963/03/28/archives/the-measles-vaccine.html | url-status = live }}</ref> The vaccine Enders developed was based on the Edmonston strain of attenuated live measles virus, which was named for 11-year-old David Edmonston, the Fay student from whom Peebles had taken the culture that led to the virus's cultivation.<ref name="pmid1603640">{{cite journal | vauthors = Hilleman MR | title = Past, present, and future of measles, mumps, and rubella virus vaccines | journal = Pediatrics | volume = 90 | issue = 1 Pt 2 | pages = 149–53 | date = July 1992 | doi = 10.1542/peds.90.1.149 | pmid = 1603640 | s2cid = 33115842 | url = http://pediatrics.aappublications.org/cgi/content/abstract/90/1/149 }}</ref>
-In the mid-20th century, measles was particularly devastating in West Africa, where child mortality rate was 50 percent before age five, and the children were struck with the type of rash and other symptoms common prior to 1900 in England and other countries.{{citation needed|date=April 2024}}  The first trial of a live attenuated measles vaccine was undertaken in 1960 by the British paediatrician [[David Morley (paediatrician)|David Morley]] in a village near [[Ilesha]], Nigeria;<ref>{{Cite web |last=Beautysays |date=2009-09-27 |title=David Morley - a career of service that started in Nigeria |url=https://nigeriahealthwatch.com/david-morley-a-career-of-service-that-started-in-nigeria/ |access-date=2022-04-29 |website=Nigeria Health Watch |language=en-GB |archive-date=29 June 2022 |archive-url=https://web.archive.org/web/20220629135727/https://nigeriahealthwatch.com/david-morley-a-career-of-service-that-started-in-nigeria/ |url-status=live }}</ref> in case he could be accused of exploiting the Nigerian population, Morley included his own four children in the study. The encouraging results led to a second study of about 450 children in the village and at the Wesley Guild Hospital in Ilesha.{{cn|date=June 2022}}
+In the mid-20th century, measles was particularly devastating in West Africa, where child mortality rate was 50 percent before age five, and the children were struck with the type of rash and other symptoms common prior to 1900 in England and other countries.{{citation needed|date=April 2024}}  The first trial of a live attenuated measles vaccine was undertaken in 1960 by the British paediatrician [[David Morley (paediatrician)|David Morley]] in a village near [[Ilesha]], Nigeria;<ref>{{Cite web |last=Beautysays |date=27 September 2009 |title=David Morley - a career of service that started in Nigeria |url=https://nigeriahealthwatch.com/david-morley-a-career-of-service-that-started-in-nigeria/ |access-date=29 April 2022 |website=Nigeria Health Watch |language=en-GB |archive-date=29 June 2022 |archive-url=https://web.archive.org/web/20220629135727/https://nigeriahealthwatch.com/david-morley-a-career-of-service-that-started-in-nigeria/ |url-status=live }}</ref> in case he could be accused of exploiting the Nigerian population, Morley included his own four children in the study. The encouraging results led to a second study of about 450 children in the village and at the Wesley Guild Hospital in Ilesha.{{cn|date=June 2022}}
 Following another epidemic, a larger trial was undertaken in September and October 1962, in New York City with the assistance of the WHO: 131 children received the live Enders-attenuated Edmonston B strain plus [[gamma globulin]], 130 children received a "further attenuated" vaccine without gamma globulin, and 173 children acted as control subjects for both groups. As also shown in the Nigerian trial, the trial confirmed that the "further attenuated" vaccine was superior to the Edmonston B vaccine, and caused significantly fewer instances of fever and diarrhea. 2,000 children in the area were vaccinated with the further-attenuated vaccine.<ref>{{cite journal | vauthors = Morley DC, Woodland M, Krugman S, Friedman H, Grab B | title = Measles and Measles Vaccination in an African Village | journal = Bulletin of the World Health Organization | volume = 30 | pages = 733–9 | date = 1964 | issue = 5 | pmid = 14196817 | pmc = 2554995 }}</ref><ref name=indie>{{cite news| vauthors = Pritchard J |title=Obituary: Dr C. A. Pearson|url=https://www.independent.co.uk/news/obituaries/obituary-dr-c-a-pearson-1293756.html|access-date=29 January 2014|newspaper=The Independent|date=13 November 1997|url-status=live|archive-url=https://web.archive.org/web/20140224220736/http://www.independent.co.uk/news/obituaries/obituary-dr-c-a-pearson-1293756.html|archive-date=24 February 2014}}</ref>
@@ Line 115: / Line 119: @@
 ==Society and culture==
-Most health insurance plans in the United States cover the cost of vaccines, and [[Vaccines for Children Program]] may be able to help those who do not have coverage.<ref>{{Cite web|title=VFC {{!}} Home {{!}} Vaccines for Children Program {{!}} CDC|url=https://www.cdc.gov/vaccines/programs/vfc/index.html|date=2019-04-02|website=www.cdc.gov|language=en-us|access-date=2020-04-30|archive-date=1 May 2020|archive-url=https://web.archive.org/web/20200501175435/https://www.cdc.gov/vaccines/programs/vfc/index.html|url-status=live}}</ref> State law requires vaccinations for school children, but offer exemptions for medical reasons and sometimes for religious or philosophical reasons.<ref>{{Cite web|title=State Vaccination Requirements {{!}} CDC|url=https://www.cdc.gov/vaccines/imz-managers/laws/state-reqs.html|date=2019-03-11|website=www.cdc.gov|language=en-us|access-date=2020-04-30|archive-date=2 April 2020|archive-url=https://web.archive.org/web/20200402194736/https://www.cdc.gov/vaccines/imz-managers/laws/state-reqs.html|url-status=live}}</ref> All fifty states require two doses of the MMR vaccine at the appropriate age.<ref>{{Cite web|title=MMR Vaccine Mandates for Child Care and K-12|url=https://www.immunize.org/laws/mmr.asp|website=www.immunize.org|access-date=2020-04-30|archive-date=12 June 2020|archive-url=https://web.archive.org/web/20200612231754/https://www.immunize.org/laws/mmr.asp|url-status=live}}</ref> A different vaccine distribution within a single territory by age or social class may define different general perceptions of vaccination efficacy. <ref>{{Cite journal | vauthors = Scirè G |date=2021 |title=Modelling and assessing public health policies to counteract Italian measles outbreaks |url=http://www.inderscience.com/link.php?id=118832 |journal=International Journal of Simulation and Process Modelling |language=en |volume=16 |issue=4 |pages=271 |doi=10.1504/IJSPM.2021.118832 |hdl=10447/513505 |issn=1740-2123|hdl-access=free }}</ref>
+Most health insurance plans in the United States cover the cost of vaccines, and [[Vaccines for Children Program]] may be able to help those who do not have coverage.<ref>{{Cite web|title=VFC {{!}} Home {{!}} Vaccines for Children Program {{!}} CDC|url=https://www.cdc.gov/vaccines/programs/vfc/index.html|date=2 April 2019|website=www.cdc.gov|language=en-us|access-date=30 April 2020|archive-date=1 May 2020|archive-url=https://web.archive.org/web/20200501175435/https://www.cdc.gov/vaccines/programs/vfc/index.html|url-status=live}}</ref> State law requires vaccinations for school children, but offer exemptions for medical reasons and sometimes for religious or philosophical reasons.<ref>{{Cite web|title=State Vaccination Requirements {{!}} CDC|url=https://www.cdc.gov/vaccines/imz-managers/laws/state-reqs.html|date=11 March 2019|website=www.cdc.gov|language=en-us|access-date=30 April 2020|archive-date=2 April 2020|archive-url=https://web.archive.org/web/20200402194736/https://www.cdc.gov/vaccines/imz-managers/laws/state-reqs.html|url-status=live}}</ref> All fifty states require two doses of the MMR vaccine at the appropriate age.<ref>{{Cite web|title=MMR Vaccine Mandates for Child Care and K-12|url=https://www.immunize.org/laws/mmr.asp|website=www.immunize.org|access-date=30 April 2020|archive-date=12 June 2020|archive-url=https://web.archive.org/web/20200612231754/https://www.immunize.org/laws/mmr.asp|url-status=live}}</ref> A different vaccine distribution within a single territory by age or social class may define different general perceptions of vaccination efficacy. <ref>{{Cite journal | vauthors = Scirè G |date=2021 |title=Modelling and assessing public health policies to counteract Italian measles outbreaks |url=http://www.inderscience.com/link.php?id=118832 |journal=International Journal of Simulation and Process Modelling |language=en |volume=16 |issue=4 |pages=271 |doi=10.1504/IJSPM.2021.118832 |hdl=10447/513505 |issn=1740-2123|hdl-access=free }}</ref>
 == References ==
@@ Line 125: / Line 129: @@
 * {{cite book | title = Immunisation against infectious disease | chapter = Chapter 21: Measles | chapter-url = https://www.gov.uk/government/publications/measles-the-green-book-chapter-21 | publisher = Public Health England | veditors = Ramsay M | url = https://www.gov.uk/government/collections/immunisation-against-infectious-disease-the-green-book | year = 2019 | location = London, England | access-date = 22 December 2019 | archive-date = 12 November 2019 | archive-url = https://web.archive.org/web/20191112005859/https://www.gov.uk/government/publications/pneumococcal-the-green-book-chapter-25 | url-status = live }}
 * {{cite book | publisher = U.S. [[Centers for Disease Control and Prevention]] (CDC) | title = Epidemiology and Prevention of Vaccine-Preventable Diseases | veditors = Hall E, Wodi AP, Hamborsky J, Morelli V, Schillie S | edition = 14th | location = Washington D.C. | year = 2021 | chapter = Chapter 13: Measles | chapter-url = https://www.cdc.gov/vaccines/pubs/pinkbook/meas.html | url = https://www.cdc.gov/vaccines/pubs/pinkbook/index.html | access-date = 22 December 2019 | archive-date = 30 December 2016 | archive-url = https://web.archive.org/web/20161230001534/https://www.cdc.gov/vaccines/pubs/pinkbook/index.html | url-status = live }}
-* {{cite book | vauthors = Gastanaduy PA, Redd SB, Clemmons NS, Lee Adria D, Hickman CJ, Rota PA, Patel M | display-authors = 3 | chapter = Chapter 7: Measles | chapter-url = https://www.cdc.gov/vaccines/pubs/surv-manual/chpt07-measles.html | veditors = Roush SW, Baldy LM, Hall MH | title = Manual for the surveillance of vaccine-preventable diseases | publisher = U.S. [[Centers for Disease Control and Prevention]] (CDC) | location = Atlanta, Georgia | url = https://www.cdc.gov/vaccines/pubs/surv-manual/ | year = 2019 | access-date = 22 December 2019 | archive-date = 1 August 2020 | archive-url = https://web.archive.org/web/20200801192220/https://www.cdc.gov/vaccines/pubs/surv-manual/ | url-status = live }}
+* {{cite book | vauthors = Gastanaduy PA, Redd SB, Clemmons NS, Lee Adria D, Hickman CJ, Rota PA, Patel M | chapter = Chapter 7: Measles | chapter-url = https://www.cdc.gov/vaccines/pubs/surv-manual/chpt07-measles.html | veditors = Roush SW, Baldy LM, Hall MH | title = Manual for the surveillance of vaccine-preventable diseases | publisher = U.S. [[Centers for Disease Control and Prevention]] (CDC) | location = Atlanta, Georgia | url = https://www.cdc.gov/vaccines/pubs/surv-manual/ | year = 2019 | access-date = 22 December 2019 | archive-date = 1 August 2020 | archive-url = https://web.archive.org/web/20200801192220/https://www.cdc.gov/vaccines/pubs/surv-manual/ | url-status = live }}
 {{refend}}
@@ Line 132: / Line 136: @@
 * {{cite web | title = MMRV (Measles, Mumps, Rubella & Varicella) Vaccine Information Statement | website = U.S. [[Centers for Disease Control and Prevention]] (CDC) | date = 22 October 2019 | url = https://www.cdc.gov/vaccines/hcp/vis/vis-statements/mmrv.html }}
 * {{MeshName|Measles Vaccine}}
-* {{cite web | url = https://druginfo.nlm.nih.gov/drugportal/name/measles%20vaccine | publisher = U.S. National Library of Medicine | work = Drug Information Portal | title = Measles Vaccine }}
 {{Vaccines}}