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they can be contaminated by other people's coughs and sneezes
If someone else is coughing and sneezing in a persons face, I think contamination of the mask is the least of their worries! Would you prefer to have no mask on so they can just cough straight into your nose and mouth?
With that logic health professionals should be mask-less then.
Fyoosh
@Fox
By the BBC's Health Editor, half an hour ago:
Coronavirus: Who should be wearing masks?
they can be contaminated by other people's coughs and sneezes or when putting them on or removing them
frequent hand-washing and social distancing are more effective
they might offer a false sense of security