@WHO: "Today WHO is publishing updated guidance on the use of masks for control of #COVID19. This guidance is based on evolving evidence, and provides updated advice on who should wear a mask, when it should be worn and what it should be made of"-@DrTedros

@WHO: "Today WHO is publishing updated guidance on the use of masks for control of #COVID19. This guidance is based on evolving evidence, and provides updated advice on who should wear a mask, when it should be worn and what it should be made of"-@DrTedros

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