The ordinary masks are ineffective against CATCHING it, but are effective in preventing someone who already has it from inadvertently giving it to OTHERS. And in the case of a disease that can be present for up to two weeks in someone without symptoms but who IS contagious, that could make a heck of a difference.
The ordinary masks are ineffective against CATCHING it, but are effective in preventing someone who already has it from inadvertently giving it to OTHERS. And in the case of a disease that can be present for up to two weeks in someone without symptoms but who IS contagious, that could make a heck of a difference.