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April: http://files.fast.ai/papers/masks_lit_review.pdf
"it was not until April 3 that the Centers for Disease Control formally recommended that Americans wear masks in public, after two months of stating precisely the opposite."
WHO appears to have change their stance in early June, before the pubs opened:
https://www.bbc.co.uk/news/health-52945210They're introducing this in late July.
hippy
Well in that case, WTF are they making them mandatory for now??