From Ars Technica article https://arstechnica.com/science/2020/06/just-10-20-of-covid-19-cases-behind-80-of-transmission-studies-suggest/ Quote “Cowling noted that Japan—which has been relatively successful at managing the pandemic—has employed an anti-superspreading policy called the three Cs: Avoid (1) Closed spaces with poor ventilation, (2) Crowded places, and (3) Close-contact settings, such as close-range conversations. The risk for superspreading is highest in situations with all three
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