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Because masks don't help prevent you getting it https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks http

• javagram 7y ago
  Your link says “ If you are healthy, you only need to wear a mask if you are taking care of a person with suspected 2019-nCoV infection.” - in other words, it does help prevent someone from getting it. The reason health organizations outside of Asia are not recommending mask wearing by the general public is there are not enough to go around, so they are trying to stop the public from hoarding them when the masks are vital equipment needed by medical providers. Wearing the masks also helps prevent infected persons (some of whom are asymptomatic with this coronavirus) from spreading it, if previous research on flu viruses is considered applicable. https://www.hsph.harvard.edu/news/features/face-masks-flu/ https://www.hsph.harvard.edu/news/features/face-masks-flu/ “These results suggest an important role for aerosols in transmission of influenza virus and that surgical facemasks worn by infected persons are potentially an effective means of limiting the spread of influenza.”
• haunter 7y ago
  But it helps asymptomatic infected people to infect others