WHO Director-General's opening remarks at the media briefing on COVID-19 and updated mask guidance from is a mask necessary when walking Watch Video
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Description: Today WHO is publishing updated guidance on the use of masks for control of COVID-19.nThis 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.nWHO has developed this guidance through a careful review of all available evidence, and extensive consultation with international experts and civil society groups.nI wish to be very clear that the guidance we are publishing today is an update of what we have b
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