A simulation model showed that people wearing plastic face shields or masks fitted with a valve can spray invisible droplets over a very wide area when they sneeze or cough.
The researchers concluded that despite the comfort that both types of protection offer, high-quality cloth or medical masks of plain design are preferential in helping prevent the spread of the virus.
The study found that a person on a poorly ventilated Chinese bus infected nearly two dozen other passengers with the coronavirus even though many weren’t sitting close by. Researchers believe a passenger, whose gender was not identified, was likely patient zero because the person had been in contact with people from Wuhan, the city where the contagion emerged late last year.
Researchers also noted the air conditioning simply recirculated the air inside the bus, which likely contributed to spreading of the virus.
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