"We know that wearing a mask outside health care facilities offers little, if any, protection from infection. Public health authorities define a significant exposure to Covid-19 as face-to-face contact within 6 feet with a patient with symptomatic Covid-19 that is sustained for at least a few minutes (and some say more than 10 minutes or even 30 minutes). The chance of catching Covid-19 from a passing interaction in a public space is therefore minimal. In many cases, the desire for widespread masking is a reflexive reaction to anxiety over the pandemic.”
-- New England Journal of Medicine.
I suggest everyone read the rest of the article for a more complete perspective. I also suggest adding the knowledge we've gained since April 1 about the possibility of the viral droplets hanging in the air for 2-3 hours, and the likelihood that asymptomatic spread is a bigger component than was thought to be in March.
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