91É«Ç鯬
Do face masks work against the coronavirus and should you wear one?
The advice on widespread face mask use to protect against covid-19 varies wildly, but there is some evidence that they stop sick people spreading the virus
News
Advertisement
The advice on widespread face mask use to protect against covid-19 varies wildly, but there is some evidence that they stop sick people spreading the virus
Cases of covid-19 have been slow to appear in developing economies, but now they are ramping up. Slums and refugee camps could be particularly vulnerable