In the selection of masks, disposable medical masks are used daily, and medical surgical masks can be used in hospitals. Ordinary people who do not have direct contact with patients do not need to wear medical protective masks with higher protection levels, KN95 masks, etc., but they can be kept at home just in case. […]
There are currently three known ways of transmission of COVID-19, mainly through respiratory droplet transmission, close contact transmission and aerosol transmission. Viruses and bacteria from sneeze can be at speeds of up to 100 miles per hour,which will disperse into more than 40,000 individual droplets (the droplets contain a lot of viruses and bacteria). By […]
