Since the outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2),
the virus that caused coronavirus disease 2019 (COVID-19), the use of face masks has
become ubiquitous in China and other Asian countries such as South Korea and Japan.
Some provinces and municipalities in China have enforced compulsory face mask policies
in public areas; however, China's national guideline has adopted a risk-based approach
in offering recommendations for using face masks among health-care workers and the
general public. We compared face mask use recommendations by different health authorities
). Despite the consistency in the recommendation that symptomatic individuals and
those in health-care settings should use face masks, discrepancies were observed in
the general public and community settings.1, 2, 3, 4, 5, 6, 7, 8 For example, the
US Surgeon General advised against buying masks for use by healthy people. One important
reason to discourage widespread use of face masks is to preserve limited supplies
for professional use in health-care settings. Universal face mask use in the community
has also been discouraged with the argument that face masks provide no effective protection
against coronavirus infection.
Recommendations on face mask use in community settings
If you are healthy, you only need to wear a mask if you are taking care of a person
with suspected SARS-CoV-2 infection.
People at moderate risk* of infection: surgical or disposable mask for medical use.
People at low risk† of infection: disposable mask for medical use.
People at very low risk‡ of infection: do not have to wear a mask or can wear non-medical
mask (such as cloth mask).
Surgical masks can prevent transmission of respiratory viruses from people who are
ill. It is essential for people who are symptomatic (even if they have mild symptoms)
to wear a surgical mask.
Wear a surgical mask when taking public transport or staying in crowded places. It
is important to wear a mask properly and practice good hand hygiene before wearing
and after removing a mask.
Wear a mask if you have respiratory symptoms, such as a cough or runny nose.
The effectiveness of wearing a face mask to protect yourself from contracting viruses
is thought to be limited. If you wear a face mask in confined, badly ventilated spaces,
it might help avoid catching droplets emitted from others but if you are in an open-air
environment, the use of face mask is not very efficient.
Centers for Disease Control and Prevention does not recommend that people who are
well wear a face mask (including respirators) to protect themselves from respiratory
diseases, including COVID-19.
US Surgeon General urged people on Twitter to stop buying face masks.
Face masks play a very important role in places such as hospitals, but there is very
little evidence of widespread benefit for members of the public.
There is not enough evidence to prove that wearing a surgical mask significantly reduces
a healthy person's risk of becoming infected while wearing it. According to WHO, wearing
a mask in situations where it is not recommended to do so can create a false sense
of security because it might lead to neglecting fundamental hygiene measures, such
as proper hand hygiene.
However, there is an essential distinction between absence of evidence and evidence
of absence. Evidence that face masks can provide effective protection against respiratory
infections in the community is scarce, as acknowledged in recommendations from the
UK and Germany.7, 8 However, face masks are widely used by medical workers as part
of droplet precautions when caring for patients with respiratory infections. It would
be reasonable to suggest vulnerable individuals avoid crowded areas and use surgical
face masks rationally when exposed to high-risk areas. As evidence suggests COVID-19
could be transmitted before symptom onset, community transmission might be reduced
if everyone, including people who have been infected but are asymptomatic and contagious,
wear face masks.
Recommendations on face masks vary across countries and we have seen that the use
of masks increases substantially once local epidemics begin, including the use of
N95 respirators (without any other protective equipment) in community settings. This
increase in use of face masks by the general public exacerbates the global supply
shortage of face masks, with prices soaring,
and risks supply constraints to frontline health-care professionals. As a response,
a few countries (eg, Germany and South Korea) banned exportation of face masks to
prioritise local demand.
WHO called for a 40% increase in the production of protective equipment, including
Meanwhile, health authorities should optimise face mask distribution to prioritise
the needs of frontline health-care workers and the most vulnerable populations in
communities who are more susceptible to infection and mortality if infected, including
older adults (particularly those older than 65 years) and people with underlying health
People in some regions (eg, Thailand, China, and Japan) opted for makeshift alternatives
or repeated usage of disposable surgical masks. Notably, improper use of face masks,
such as not changing disposable masks, could jeopardise the protective effect and
even increase the risk of infection.
Consideration should also be given to variations in societal and cultural paradigms
of mask usage. The contrast between face mask use as hygienic practice (ie, in many
Asian countries) or as something only people who are unwell do (ie, in European and
North American countries) has induced stigmatisation and racial aggravations, for
which further public education is needed. One advantage of universal use of face masks
is that it prevents discrimination of individuals who wear masks when unwell because
everybody is wearing a mask.
It is time for governments and public health agencies to make rational recommendations
on appropriate face mask use to complement their recommendations on other preventive
measures, such as hand hygiene. WHO currently recommends that people should wear face
masks if they have respiratory symptoms or if they are caring for somebody with symptoms.
Perhaps it would also be rational to recommend that people in quarantine wear face
masks if they need to leave home for any reason, to prevent potential asymptomatic
or presymptomatic transmission. In addition, vulnerable populations, such as older
adults and those with underlying medical conditions, should wear face masks if available.
Universal use of face masks could be considered if supplies permit. In parallel, urgent
research on the duration of protection of face masks, the measures to prolong life
of disposable masks, and the invention on reusable masks should be encouraged. Taiwan
had the foresight to create a large stockpile of face masks; other countries or regions
might now consider this as part of future pandemic plans.
© 2020 Sputnik/Science Photo Library
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