Largest study on masks and Covid-19 demonstrates their effectiveness in the real world
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New Report Indicates Effectiveness of Masks in Preventing Spread of COVID-19
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114K views · 705 reactions | A study at the Mater Hospital in Dublin has highlighted the effectiveness of masks and face coverings in fighting #Covid19, while showing up a potential issue with visors | https://bit.ly/340QGmE | RTÉ News | Facebook
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114K views · 705 reactions | A study at the Mater Hospital in Dublin ha…
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