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ONE recent study at a Florida Hospital found that the Covid-19 virus could be isolated from air samples of up to 4.8 meters from infected patients. Matthais Echternach, head of phoniatrics and pediatric audiology at Ludwig-Maximilians University Hospital, Munich, agrees that perhaps the most effective way to use a face shield is to wear a mask underneath it. Just wearing a face shield is not going to be very protective. The tighter the mask underneath, the better, adding that gaps can cause aerosols to escape and get in even with tight-fitting masks and wisps of facial hair around the seal. Hence, the LRT 2 system added wearing a face shield apart from a face mask as a requirement for those riding a train.
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