How COVID spreads indoors. Nice graphics and description from @elpaisinenglish

6 people are in a room for 4 hours. One has COVID but no one knows. @el_pais
@jeremyphoward @zeynep @trishgreenhalgh
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https://english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html

Even with safe distances, if no one is masked, after 4 hours talking in a closed room, almost everyone can get infected.

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If everyone wears a mask but spends 4 hours talking indoors with no ventilation, many are still at risk of infection.
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If everyone is masked, and they cut the time spent talking together by 50%, and there is good ventilation, less than one will be infected.

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