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From what I have read there really is not a medical consensus on whether large scale mask wearing in public would help against the spread of Covid-19. Its not a simple question. There is the potential for it to prove counter productive and end up increasing the wearer's chance of contracting it, even as it is reducing their likelihood of transmitting it.
And there are clear dangers in insisting everybody does so if it puts pressure on supplies for those we know for sure need them, like front line medical staff.
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