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Covid-19 research shows downsides of face shields and valve masks

Face shields and masks with exhalation valves have become a popular alternative for people looking for protection against Covid-19, the disease caused by the new coronavirus, but American research has cast doubt on their effectiveness.Researchers from Florida Atlantic University examined the performance of face shields and exhalation valves in impeding the spread of aerosol-sized droplets – one of the main forms of Covid-19 transmission – with disturbing results.While clear plastic face shields…

Read the original article at South China Morning Post

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