Patient Information

Dengue Fever
What is dengue fever? Dengue fever is an infection caused by 1 of the 4 viruses called the
dengue viruses. They are related to each other, but are not exactly the same. Getting sick from 1
dengue virus does not protect a person from the others. A person can get dengue fever more than
once.
Dengue fever is spread by mosquitoes that carry dengue viruses. People who live in areas where
these mosquitoes are common have the highest risk of infection. These areas include southern Asia,
Central and South America, and the Caribbean.
What are the symptoms of dengue fever? Symptoms usually happen 4 to 7 days after a bite
from a mosquito that carries dengue virus. But they can happen up to 2 weeks later. Symptoms
usually last 5 to 7 days.
Dengue fever symptoms are different for each person. They can be mild or severe. They can
include:
Fever
Headache
Pain behind the eyes
Joint and muscle pain
Feeling tired, sometimes for days to weeks
Rash This can be flat or have small bumps. It might be itchy. A rash is more common in
people who have
not been infected with a dengue virus before.
Stomach problems, such as nausea, vomiting, and diarrhea
Cough, sore throat, and stuffy nose The throat might look red.
Small purple spots on the skin or bowel movements that look black
Red eyes
Swollen glands
Children and younger people often have less severe symptoms. People who had dengue fever in the
past and get infected with a different dengue virus have the highest risk of severe symptoms.
A person with severe dengue fever might:
Have bad belly pain
Get bruises without bumping into anything The person might also have small purple spots
on the skin.
Vomit blood
Get nosebleeds
Have black bowel movements
Have seizures A person who has a seizure might pass out or move or behave strangely.
For example, he or she might shake or fall down.
A woman might also have bleeding between her menstrual periods.
Should I see a doctor or nurse? Yes. If you live in a country where dengue fever is common,
see a doctor or nurse if you have any of the symptoms.
If you used to live in a country where dengue fever is common, and recently went back for a visit,
see a doctor or nurse if you have any symptoms of dengue fever. You might have had an infection

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when you lived there, and gotten infected again on your visit. People who visit these countries often
should also see a doctor or nurse if they have symptoms.
Is there a test for dengue fever? Yes. A doctor might be able to tell if you have dengue fever by
doing an exam and learning about the symptoms. He or she can also do blood tests. These tests
can find the dengue viruses. It sometimes takes 2 different tests to tell for sure.
In countries where dengue fever is common, you might not get a blood test. But doctors can still
treat the symptoms if they think you have it.
How is dengue fever treated? There is no treatment for the virus that causes dengue fever, but
doctors can treat the symptoms. Very sick people can be treated in the hospital. Treatments include:
Blood transfusions If the infection causes severe bleeding, doctors can give the person
blood that someone
else has given to the hospital.
Getting fluids through a tube called an IV
Some people are at risk of getting sicker from dengue fever than other people. These people
include:
Pregnant women
Babies
Older people
People who are obese
People who have diabetes, kidney failure, or certain blood diseases
These people might need to go to the hospital if they get dengue fever. Doctors can watch for severe
symptoms and treat them if they happen. People who live alone or far from a doctors office or
hospital might also need to stay in the hospital. That way, they can be treated right away if they get
very sick.
People who are not as sick can usually rest at home. If you have dengue fever, you might need to
see a doctor or nurse every day until you get better. The doctor or nurse can do blood tests and
check your blood pressure. These checkups are important because dengue fever can cause serious
bleeding. Doctors can look to see if this is happening, and treat it early if it does.
Is there anything I can do on my own to feel better? Yes. If the doctor says you do not need to
go to the hospital, you can stay home, rest, and drink plenty of fluids. You can also take
acetaminophen (sample brand name: Tylenol) to relieve fever and aches.
Do not take aspirin or NSAIDs, such as ibuprofen (sample brand names: Advil, Motrin) or
naproxen (brand name: Aleve). These medicines can increase the risk of bleeding in people with
dengue fever. Never give aspirin or medicines that contain aspirin to children younger than 18. In
children, aspirin can cause a serious problem called
Reye syndrome.
Can dengue fever be prevented? Yes. The best way to prevent dengue fever is to avoid the
mosquitoes that carry it. Not all countries where dengue fever is common control mosquitoes well.
But you can lower your chances of getting dengue fever if you live or travel there. You can:
Stay inside during the day, when the mosquitoes that carry dengue fever are active.
Buildings with screens and air conditioning are safest.
Wear shoes, long-sleeved shirts, and long pants when you go outside.

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Patient Information
Wear bug spray or cream that contains DEET when you are outside. Check the label to
make sure.
Drain any standing water near your home, such as wading pools and buckets. Mosquitoes
breed in standing
water.

There is no vaccine for dengue fever yet.

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