COVID-19: How much protection do face masks offer? – Mayo Clinic

Can face masks help slow the spread of the coronavirus (SARS-CoV-2) that causes COVID-19?

Yes, face masks combined with other preventive measures, such as frequent hand-washing and social distancing, help slow the spread of the virus.

So why weren’t face masks recommended at the start of the pandemic?

Source: COVID-19: How much protection do face masks offer? – Mayo Clinic

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