As guidance on wearing face masks to slow coronavirus evolves, what does the science say about when and where to wear them?
When can they protect people from the virus?
World Health Organization special envoy Dr David Nabarro has suggested that more widespread use of masks will become"the norm" as the world adjusts to living with Covid-19.Coronavirus is spread by droplets that can spray into the air when those infected talk, cough and sneeze.
But he said masks might also need to be worn by non-medical workers who are in frequent contact with others and who can't distance themselves, such as people operating cash registers, or hairdressers. But Dr Nabarro warned against complacency:"Don't imagine that you can do what you like when you are wearing a mask. [It] doesn't give you the excuse to disregard social distancing."Sir Patrick Vallance, the UK's chief scientific adviser, says there is a review ongoing at the moment and it has already seen"more persuasive" data on it stopping you passing on the virus, rather than catching it. However, the advice has yet to change.
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