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How well do face masks protect against COVID-19?

Face masks can help slow the spread of coronavirus disease 2019 (COVID-19). Learn about mask types, which masks to use and ...
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How effective are face masks against flu spread?

People on public transport are wearing face coverings again, while hospitals are asking staff and patients to mask up. Not just a blast of nostalgia for 2020, it’s due to a strain of flu rampaging ...