你是说唾液不含病毒还是说低于可测试浓度就不会传染？

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送交者: silxirt 于 2020-08-22, 15:02:51:

回答: 戴口罩保护他人勉强算是一个理由，效果很难说 由 LB 于 2020-08-22, 13:01:06:

Aerosols are emitted by a person infected with coronavirus — even one with no symptoms — when they talk, breathe, cough, or sneeze. Another person can breathe in these aerosols and become infected with the virus. Aerosolized coronavirus can remain in the air for up to three hours.


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