augieray, No surprise here: A STUDY on #COVID19 risks in public settings finds that "The pooled SAR (Secondary Rate of Attack) for community indoor settings was 20.4%. The setting-specific SARs were highest for singing events (SAR 44.9%), indoor meetings and entertainment venues (31.9%), and fitness centers (28.9%). "
https://academic.oup.com/jid/advance-article/doi/10.1093/infdis/jiae261/7675302?login=false
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