Re:The SF Anti-Mask League of 1919
by belorn on Monday April 20, 2020 @07:15AM
(#22922866)
The question then in context become if mask helps during those 2-3 days before symptoms appear. There is a few links above that links to the effectiveness against coughing and sneezing, but I would guess those are symptoms.
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Nobody knows. We know that "real" masks (i.e. n95 or better) are effective when worn properly, but many people don't wear them properly.
The evidence for effectiveness of other kinds of masks in the prevention of virus transmission is weak, at best.