Infectious Disease Control
Infectious Disease Control
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Chapter
6 Marcel Verweij
Introduction
Infectious diseases have been one of the major factors affecting public health in the past,
and will probably remain so in the future. There was a time that physicians thought that, at
some point in the future, the perils of infectious diseases would have been overcome. In the
middle part of the twentieth century, progress was made in controlling diseases such as
smallpox, measles, typhoid and plague. Better diet and hygiene, improved living conditions
and vaccinations all helped to strengthen people’s immunity against several diseases.
Patients who got ill could be treated effectively with antibiotics. Morbidity and mortality
due to several infectious diseases decreased significantly. However, this success story has
had its limits: advances in medicine and public health have mainly benefited the developed
world, whereas infectious diseases in the developing world have remained high; new viruses
such as HIV and SARS have created new problems in both high- and low-income contexts;
extreme multi-drug resistant forms of tuberculosis are spreading, especially among people
living with HIV and AIDS; and, lastly, at the beginning of the twenty-first century, many
countries and the World Health Organization started preparations for an influenza pan-
demic that could in the future be reminiscent of the 1918 Spanish Flu.
Medical treatment of patients with clinical symptoms is only one and probably not the
most important way to control infectious diseases. The spread of disease can be reduced
most effectively by controlling infection, for example by improving hygiene, by social
distancing or quarantine, by raising immunity, etc. Many of these interventions require
collaborative ‘public’ action (Verweij and Dawson, 2007). If human contact is a source for
infection, then preventive measures must aim at reducing or even prohibiting such contacts.
However, such measures can have negative if not detrimental consequences for some.
Measures of control may involve excluding some individuals or groups from public life.
This chapter discusses various examples of measures to protect public health against
infectious diseases. The focus will be on contagious disease that spreads from human to
human, because controlling measures against such diseases can have a deep impact on
personal life and well-being. Moreover, such controlling measures are often compulsory
and set constraints on the liberties of individuals or groups. The largest part of the ethical
discussion in this chapter will focus on the justifications for such compulsory interventions.
Protection against animal diseases (including avian influenza), food-borne diseases (for
example, salmonella) and non-contagious diseases (for example, tetanus) also raise moral
questions but these will not be discussed.
Public Health Ethics, ed. Angus Dawson. Published by Cambridge University Press. # Cambridge
University Press 2011.
100
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Chapter 6: Infectious disease control 101
Historic examples
The phrase ‘social distancing’ as a measure to prevent infection is a relatively new term,
but it has been practised throughout history; as long as it has been known that certain
diseases are contagious. People have always tried to protect themselves and others by
setting patients with particular diseases ‘apart’, and excluding them from the rest of
society. People with suspected symptoms of a disease could be treated as outcasts or
outlaws, or sent to a closed institution, such as a leprosarium. History provides numerous
examples that illustrate how such measures could be harmful and unjust to the victims of
disease. Saul Brody describes how in the Middle Ages, leprosy patients – or at least
persons who were thought to have this disease – were cast out of society. The first step
would be to detect suspected lepers. They were then presented to special committees of
‘experts’ with the job of making a diagnosis. This physical examination might be carried
out by doctors and surgeons, or often certain laypersons, such as gate porters, policemen,
priests, monks or even other lepers (Brody, 1974: 63–4).
There must have been a considerable risk that diseases were misclassified: any skin disease
or abnormality could be seen as a form of leprosy. If a person was judged to be a leper, the
victim was told that he would be separated from the healthy population. The law could be
very hostile to lepers, and for many, the leprosarium might even be a relatively save haven:
In brief, the law could place a person outside of society by depriving him of his rights to marry or
to stay married, and to own and transmit property. It could simply and effectively deprive the leper
of the right to have a home, and that being so, it could compel him to depend upon the very
society which, out of loathing and fear, wrote those laws. Under such circumstances, the best the
leper could do would be to turn from the world and enter the closed society of the leprosarium.
There, at least, he would have a bed and food. The prison could also be a refuge.
(Brody, 1974: 86)
This may sound like ending the social life of a person, and actually it was meant to be so: the
diagnosis of leprosy could be a reason for authorities to officially declare that the victim was
now judged socially dead. The church played an important role, providing symbols and
rituals that were similar to those of a funeral. A mass was held for the leper, who at some
places was required to stand in a grave in a cemetery. The officiating priest would throw
some earth from the grave over the victim’s head, explaining that this symbolized the death
of the leper to the world. As harsh as this may sound, the fear of leprosy sometimes led
some to enact even more drastic measures. For example, Henry II of England, as well as
Philip V of France,
. . . chose to replace the religious service with a simple civil ceremony. It consisted of strapping
the leper to a post and setting him afire. [Edward I of England] adhered a trifle more closely to
the letter of the ecumenical decree. Lepers, during his reign, were permitted the comforts of a
Christian funeral. They were led down to the cemetery and buried alive.
(Roueché, 1953: 117)
Leprosy is a devastating and mutilating disease, which explains the phobia-like responses to
lepers throughout history. However, despite this fear, leprosy was not a disease that
disrupted cities or the whole of society like some epidemics of other infectious diseases.
For example, the various pandemics of bubonic plague could easily destroy city life in a
short time, as the panic accompanying such disasters must have been immense. The Great
Plague of 1665 killed almost one-third of the inhabitants of London who did not flee
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102 Section 2: Issues
(Moote and Moote, 2004). Whole families passed away. People would become ill and die on
the same day. Inevitably, such panic could lead to drastic measures. Houses of patients
could be sealed until the victims either recovered or died. Guards were posted at the door to
see that no one got out. The guard had to be bribed to allow any food to pass to the inmates.
If patients were not isolated at home but sent to a plague house, they did not only face the
dangers of the plague itself, as unconscious patients were easily confused for those who were
deceased and taken to the cemetery. Although some authorities advised against burying
corpses for 24 hours after death, the fear of infection stimulated caregivers to bury victims
as soon as possible (Noordegraaf and Valk, 1988: 104). If a patient recovered from the
disease, he or she could still be considered dangerous. Like other suspected persons, they
were often required to walk with a white stick, thus motivating others to avoid them
(Noordegraaf and Valk, 1988: 103).
In order to prevent spread of the plague in 1347, the city of Venice and other cities
proclaimed quarantine measures for ships coming from infected areas. Such ships and their
crew were isolated initially for 30, later for 40 days (quaranti giorni). People who did not
develop symptoms of the disease were released after this period and allowed to enter the city
(Biraben, 1976: 173–5). The quarantine rules thus went beyond isolating patients from
healthy persons: all persons on a ship coming from a suspect area were sent to quarantine.
In theory, these measures could protect cities against incoming disease, but they involved
clear risks for those held in quarantine: if someone among them became ill, all ran the risk
of being infected. Some may have tried to escape from quarantine, but they would then face
other risks: violations of the quarantine orders could be punished with the death penalty.
Another classic example of isolation and restriction of liberties is the story of ‘Typhoid
Mary’ (Porter, 1997: 424–5; Wald, 1997). Between 1900 and 1907 Mary Mallon was a cook
in New York. Twenty-two people for whom she cooked or cared for developed typhoid
fever. Mallon remained healthy, but she was suspected and later identified to be a carrier of
the disease. Understandably, she could not grasp that she had caused all the cases of disease,
not having been ill herself. Mary Mallon was isolated against her will in a hospital on North
Brother Island in 1907. In 1910 the public health authorities released her, on condition that
she would refrain from taking up her job as a cook. Unfortunately, in 1915 she did return to
cooking, accepting a job in the Sloane Hospital for Women. Twenty-five people developed
typhoid fever and two of them died. Again Mallon was identified as the vector, and this time
she was sent into quarantine for life. She died in 1938, after having been quarantined for
26 years of her life.
Mary Mallon’s case is especially interesting from an ethical perspective, because she was
not only restricted in her liberties (apparently for good reasons) but also held personally
responsible for the spread of disease. Public health officials possibly contributed to this
accusation, naming her ‘Typhoid Mary’ in their medical publications. Later newspaper
articles showed cartoons of Mallon adding small skulls in a frying pan (The New York
American, 20 June 1909). For the public it might have been difficult not to see her as an evil
cook who poisoned her employers and clients.
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104 Section 2: Issues
detecting those infected and so stop further spread of the disease. One of the problems
for any screening programme is that tests and procedures can be imprecise. Test results
can therefore be unreliable as an indication of disease. Where there is a case of an
alarming outbreak of a highly infectious disease, screening of travellers should not ‘miss’
cases. However, if tests are made very sensitive – hence minimizing the risk that cases
are missed (false-negatives) – this will inevitably lead to large numbers of false-positive
test results. Consequently, many passengers will need to undergo further examination
and tests before they can be allowed to continue on their journey.
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Chapter 6: Infectious disease control 105
not respected in public health, many patients with infectious diseases may postpone or
even forego visiting a STD clinic. Confidentiality has its limits, but partner notification
without consent, as a measure of infectious disease control, may only be justified in
exceptional cases.1
1
Such a breach of confidentiality may be justified more often in the practice of individual health care.
One such case would be where a health care provider, for example, a family physician, is caring for a
patient who has a sexually transmitted disease and who refuses to tell their spouse, and where the
physician also has a caring relationship with the spouse. The patient’s refusal would make it
impossible for the physician to sustain a fiduciary relationship with their other client.
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106 Section 2: Issues
limit the transmission of the disease to non-isolated individuals (Gostin, 2000: 210).
Quarantine also involves separation, but this applies to healthy individuals or groups who
may have been exposed to a contagious or possibly contagious disease. Both isolation and
quarantine measures can be applied to large groups. As was illustrated in the historical
examples given above, extreme forms of isolation or quarantine may be similar to putting
individuals in jail, excluding them from public life completely – possibly for the rest of their
lives. Even if the means of separations are less severe, the impact on personal life may be
overwhelming, as it combines most of the adverse events that arise in all other public health
measures. Isolation and quarantine effectively make it impossible for individuals to con-
tinue their lives as planned, to fulfil their jobs and responsibilities, to earn their living, to see
and care for their loved ones. The separation of persons also has an important symbolic
dimension. Individuals or groups are labelled as dangerous, which could undermine their
sense of being part of a community. Being separated from the community, there is a risk
that isolated and quarantined groups will not have sufficient access to such basic needs as
food or health care. In short, all quarantined and isolated individuals are deprived of at least
some essential sources for well-being. Moreover, quarantine measures may mean that all
suspected persons are held together: this includes persons who are in fact exposed to the
disease and may get ill in the short term, as well as those who are only believed to be
exposed but are in fact not infected. The non-infected persons may be detained with people
who may infect them. In this way, quarantine procedures, while intended to reduce the risks
of contagion within the larger population, may actually increase the risk for (at least part of)
the quarantined population.
It is clear that isolation and quarantine procedures can have extremely adverse implica-
tions for individuals and that procedures should be applied with due care. In the last few
decades, much work has been done to develop procedures and regulations in such a way
that risks for quarantined persons are minimized, and that they at least have rights to due
process that protect citizens from arbitrary detention. However, even if these measures are
applied with due care, they remain morally problematic and require a strong moral
justification. Before turning to this issue, let me briefly discuss a last category of measures
of infectious disease control.
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108 Section 2: Issues
judgments may get easily confused. As a result, diagnosed patients or suspected persons
may be systematically avoided and have their interests neglected. In short, while public
health measures, from screening to quarantine, are aimed at protecting the health and
welfare of the public, such measures inevitably will have negative if not detrimental effects
on the well-being of certain sub-groups.
Second, even apart from the impact on human well-being, the constraints on liberty and
individual rights are morally controversial as such. Measures of infectious disease control
may force people to behave in specific ways, hence curtailing their freedom of choice and
movement. Surveillance and notification policies may be considered a violation of rights to
privacy and confidentiality; and compulsory vaccinations and treatment violate moral
rights to bodily integrity. A central idea behind these values is that individual persons are
capable of reasoning, making choices and determining the course of their lives – and that
these capacities are grounds for respecting persons and the choices they make. In a liberal
society where individual rights are considered of utmost importance, the possibilities to
curtail or overrule those rights should therefore be limited. One should treat persons with
respect: that is, treat them as ends in themselves, and not merely as means to or obstructing
factors for the realization of other ends – however worthwhile aims such as the protection
of health might be. They are autonomous beings, that is, beings with practical reason, who
can and do set their own ends. Rules of informed consent – as common as they are in
individual health care – are often seen as especially important in protecting autonomy. The
ideal route for infectious diseases control is therefore to inform persons about necessary
precautions (to have themselves screened, to isolate themselves, to accept treatment, etc.)
and to trust that they will act accordingly. However, the circumstances of infectious diseases
control, and especially outbreak management, are far from ideal. Infectious diseases may
raise panic, and people may distrust government institutions, and therefore refuse to
cooperate. Moreover, while measures of infectious disease control are aiming at protecting
the health of the many, they will often impose risks on individual persons. Hence, for these
individuals it could be most rational to refuse to cooperate, and to avoid tests, quarantine or
vaccination. In such circumstances, compulsory measures may be inevitable to prevent
spread of disease. Which moral grounds could provide justification for such infringements
on individual rights and freedom?
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Chapter 6: Infectious disease control 109
HP1: It is justified to restrict the liberty of person A in order to prevent A from causing harm
to person B.2
Moreover, according to Mill, this is the only justification of liberty-limiting actions and
policies. Even the strongest libertarian will agree with liberty-limiting interventions that
protect against harm, and HP1 is therefore relatively uncontroversial. Moreover, the
application of the principle to protection against the harms of infection may seem rather
straightforward. The principle and its application however do raise important questions.
First, the concept of ‘causing harm’ is not as clear as one might hope – certainly not in
relation to the harmful nature of contagion. Second, the harm principle as understood in
HP1 can be given a very strong justification as it is in a sense a necessary condition to
freedom as such, but this is a rather narrow interpretation of Mill’s harm principle.
Although HP1 may apply to certain measures of infectious diseases control, many forms
of infection (hence policies to prevent infection) fall outside the scope of HP1. Many
authors in fact endorse a broader interpretation of the harm principle, but such an
expanded principle HP2 (see below) may require other sources of justification.
‘Causing harm’
A paradigmatic case of harm, where the harm principle would obviously apply, is one where
someone deliberately intends to infect another with a dangerous disease. A recent example
is the Groningen case in the Netherlands. In 2007, three people in Groningen were arrested
because they had injected others with HIV-infected blood. The culprits – all HIV seroposi-
tive themselves – contacted their victims through internet chat boxes, and invited them to
homosexual sex parties at home. During these meetings they first intoxicated their victims,
and then administered intravenous injections with HIV-infected blood. They also injected
blood in each other’s veins, ‘just for the kick’ as they confessed after their arrest.
Although persons with HIV can be treated relatively well (at least in high income
countries), the infection does severely undermine their health. Adequate medical treatment
involves a complex regimen of drugs that negatively affect their quality of life. A deliberate
and malevolent act to infect someone else with HIV is a clear case of harm. State interven-
tions to prevent such harms and to punish evildoers are justified on the basis of the harm
principle.
The Groningen case may be a paradigmatic case of inflicting harm, but it is not a
paradigm case of infectious disease control. Public health measures to control contagious
diseases do not focus on active malevolent behaviour, but on more common means of
infection. For example, even though persons may be aware that they are a carrier of a virus
or other infectious agent, they may simply forget to take precautions, or otherwise act
negligently and spread disease. The story of ‘Typhoid Mary’ Mallon is a case in point. At
some point she was told she carried a disease that could be easily transmitted if she worked
in a kitchen, but she decided to take up her job after all, hence infecting more persons. As
discussed before, public health measures that demand people isolate themselves, or refrain
from certain activities, or otherwise take precautions, may be detrimental to their own well-
being, and this may well motivate them to be non-compliant or negligent. The reason why
such measures as compulsory isolation are used is because such behaviour, even though
2
It is not necessary for the principle that B is a specific person. It could be a non-assignable member of
the public.
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110 Section 2: Issues
normally not malevolent, can be dangerous to others. If there is a clear risk that infected
persons will harm others, even though the harm is caused by negligent rather than
malevolent behaviour, then the harm principle may justify compulsory measures.
So far we have focused on cases where people have negligently or malevolently imposed
risk on others. Again, these cases cover only part of all current possibilities for compulsory
measures. Infectious diseases may spread where no one is yet aware of the infection.
A disease could have an incubation period where an asymptomatic person is already
infectious. Or persons may have certain symptoms, but not realize that they are infectious.
Many policies – including compulsory measures – aim to prevent spread of disease in such
contexts: mandatory screening at borders, routine HIV-tests for pregnant persons in risk
groups, prohibition of mass events, closing of schools, etc. Can the concept of harm and the
scope of the harm principle be stretched much further, and justify such measures as well? It
is often assumed in public health law and ethics that the principle can be as broad as this
(Gostin, 2003). Yet this depends partly on how the principle and its core concept, harm, are
understood.
Is it correct to assume that Sally, who does not know she is a hepatitis B carrier, and who
has unprotected sex with Richard, is causing harm to Richard? Is Henry causing harm to his
colleagues if he goes to work, unaware that he is a vector for a new and dangerous influenza
virus? Paul got very ill and was admitted to a hospital, and now it appears that he has SARS
and that he infected two nurses who cared for him. Did Paul harm the nurses?
Maybe Sally is causing harm if we assume that she and Richard should have taken
precautions against sexually transmitted diseases anyway. If that is true, this may reveal that
‘harming others’ and even ‘causing harm’ are normative concepts, that only apply when
certain moral norms are transgressed.3 Joel Feinberg (1984: 36) indeed defines harm as a
wrongful setback to the interests of another person, where ‘wrongful’ refers to transgression
of a moral norm (Feinberg,4: 36). Certainly Henry can not be considered as harming his
colleagues, if harm would involve the transgression of a moral norm: he just goes to work
and is perfectly justified in doing so. Paul did not ‘do’ anything, and even though actually
his admittance to the hospital did appear to be a threat, there is no sense in which Paul
could have been responsible for it. This seems to imply that, if we emphasize the moral
nature of causing harm, HP1 only justifies compulsory measures towards persons who are
in some sense responsible for the harm that they produce.5 Compulsory policies towards
persons who are unaware that they pose a threat to the health of others might not be
justified on this interpretation of the harm principle.
3
The example may provoke the reaction that Richard can not be said to have been harmed if he
agreed to having unprotected sex (volenti non fit injuria), but this only affirms the claim that harm is
a moral concept.
4
However, Feinberg is specifically focusing on the role of the harm principle in the context of criminal
law, and this may be a reason for thinking that the relevance of his concept of harm in the
context of infectious disease control is limited.
5
Note that this is not just a result of the definition of harm as such, but also in our understanding of
someone causing harm. Did Henry cause harm to his colleagues, or was the harm caused by the
virus? Statements of causal responsibility may seem purely empirical, but when they concern actions
or omissions of persons, they will inevitably involve evaluative statements that presuppose some
background of norms (Yoder, 2002).
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Chapter 6: Infectious disease control 111
HP2: It is justified to restrict the liberty of person A in order to prevent harm to others.
(Brink, 2007)
This principle neither requires causal responsibility nor moral responsibility of A for the
harms that are to be prevented. Hence, on this principle also compulsory measures can be
justified towards persons who are unaware that they pose a risk: for example, compulsory
screening of travellers at airports or mandatory HIV tests for pregnant women. A policy by
which all incoming travellers are screened for specific contagious diseases will lower the risk
that outbreaks will occur within a country. Measures that temporarily prohibit the
gathering of large groups of people will inhibit the spread of infection across a population.
This principle could even support compulsory policies towards persons who are known to
be not infected at all, for example vaccination policies of specific groups in order to prepare
for a bioterrorist attack.
As attractive as this interpretation of the harm principle may seem for effective
infectious disease control, it does raise a problem – at least for many libertarians.
If it is irrelevant what or who caused the harm that is to be prevented, almost any
compulsory policy that may promote or protect the health of others could be justified.
For example, the state could openly force some persons into quarantine in order to
convince the public that there is a serious threat to public health and that ‘the state
means business’, thereby stimulating the public to comply all the better (Wilkinson,
2007). Parents could be required to have their children vaccinated against seasonal
influenza, because that may reduce mortality among the elderly (Reichert et al., 2001).
Citizens could be required to pay for vaccination and treatment of persons who cannot
afford such forms of health care, etc. This is not to suggest that such policies would
necessarily be wrong. However, these policies, and the revised version of the harm
principle, may have little to do with the initial attractiveness of the harm principle
in a liberal framework. The harm principle is often presented as a justification for
compulsion and punishment that even the notorious libertarian could accept. This is
because the principle (at least HP1) is still consistent with allowing every person a
maximum liberty.
The revised version of the harm principle, HP2, however also justifies constraints on
freedom of citizens if, for example, that would protect the health of persons who are
relatively frail anyway. This would raise a discussion about whether such interventions
‘really’ aim to prevent harm to those persons, or ‘just’ confer benefits to them (Brink, 2007).
Libertarians would complain that the revised version of the harm principle is not just aimed
at the protection of liberty, but it is already trading off liberty against health and well-being.
Such a trade-off however may well be acceptable – if not essential – in many other
normative theories. Let us briefly focus on two such theories.
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Chapter 6: Infectious disease control 113
Although consequentialists and egalitarians may both support the expanded version of
the harm principle (HP2), there will also be differences. HP2 fits within a general liberal
framework which the consequentialist may not accept. HP2 still focuses on harm to others
and therefore does not cover paternalistic interventions that restrict someone’s freedom in
order to prevent harm to him or herself. For the consequentialist, all harms, including self-
imposed risks, could be a reason for intervention. Moreover, consequentialists may argue
that in the context of infection it will often be difficult to distinguish acts that are purely
self-regarding. Most contagious diseases do not stick to persons who accepted the risk of
being infected; they will spread from them to others as well.
Liberal egalitarians might respond that at least in some contexts, individuals have the
possibility and responsibility to protect themselves against infection. Sexually transmit-
ted diseases are a good example. Compulsory measures to prevent infection might be
justified where individuals cannot be reasonably expected to protect themselves. If
individuals can easily choose to have protected sex, public health authorities should be
reluctant to intervene and compel them to take precautions. For that matter, compulsory
measures would require interventions in people’s private spheres – interventions which,
if not impossible, would at least be highly impractical. Such pragmatic considerations
will also be relevant to the consequentialist. Moreover, many consequentialists may aim
at promoting well-being and freedom, and for them HP2 will be a reasonable trade-off
between both values.
Magnitude of harm
A first issue that will be relevant in any justification of compulsory measures is that the
harm or risk to be averted should be significant and realistic. Chicken pox and the
common cold are contagious, but, apart from special circumstances, do not create clear
risks to individuals or the population. Symptoms of chicken pox may be very annoying
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114 Section 2: Issues
for patients but it is questionable whether one should consider these as harms at all. Many
other contagious diseases however have irreversible effects on the well-being of patients,
or are otherwise mutilating or lethal. Therapeutic possibilities are limited which further
decreases the prognosis for infected patients, as in the case of extremely resistant forms of
tuberculosis. The magnitude of the harms that can be prevented does not only depend on
how severe a disease is for a patient, but also on the mode and speed of transmission.
Infections that lead to severe disease but that also spread rapidly within a population pose
a serious threat to the public health at large. Such a disease, if not averted, will affect many
individuals, and the ravages will not only be visible in each patient, but also on a
population level.
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Chapter 6: Infectious disease control 115
where less restrictive measures have been tried, and have failed (Annas, 2002). This may be
applicable to treatment of tuberculosis patients, where detention of a patient could be an
option after more voluntary approaches to enhance compliance to therapy have been tried
and failed. However, in emergency situations and public health crises there may be few
possibilities to try voluntary approaches first. ‘The least restrictive alternative’ therefore
makes sense as a general principle that urges public health authorities to compare options
and reflect on which measures are really necessary, but it is not a criterion that can be
simply applied.
6
In fact, trust cannot be easily created or promoted. Meijboom et al. (2006: 432–4) argue that,
ultimately, only trustworthiness strengthens trust. Yet if public health authorities publicly justify the
measures they take, and if they are accountable for the implications for citizens (including fair
compensation schemes, etc.), they do become more trustworthy.
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116 Section 2: Issues
Compulsory screening for dangerous infectious diseases, contact tracing, case reporting,
isolation and quarantine, vaccination or treatment – all these measures can deeply interfere
with people’s well-being and freedom, and they require a strong moral justification. There
should be sufficient evidence that a coercive measure is necessary to prevent significant
harm to others. Paradoxically, the more this measure and its justification is endorsed by the
public, the less force and compulsion may be required to protect public health.
Acknowledgement
I have had some very illuminating discussions with Franck Meijboom, Angus Dawson and
Frans Brom that have helped me in developing the argument in this chapter.
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Chapter 6: Infectious disease control 117
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