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This short commentary posits that widescale wearing of masks by the general public in our current COVID-19 reality is a commonsense precaution. Wearing masks in public, and, when necessary, at home can prevent some transmission of the infection.
Waiting for randomized controlled trial evidence before adopting masks as a policy is likely to cause harm when even limited protection offered by mask wearing is likely to save some lives.
This abstract is available on the publisher's site.
The precautionary principle is, according to Wikipedia, “a strategy for approaching issues of potential harm when extensive scientific knowledge on the matter is lacking.” The evidence base on the efficacy and acceptability of the different types of face mask in preventing respiratory infections during epidemics is sparse and contested. But covid-19 is a serious illness that currently has no known treatment or vaccine and is spreading in an immune naive population. Deaths are rising steeply, and health systems are under strain.
This raises an ethical question: should policy makers apply the precautionary principle now and encourage people to wear face masks on the grounds that we have little to lose and potentially something to gain from this measure? We believe they should.