really interesting given they seemed to all still share bathroom door handles and elevator buttons
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The Quillette article on the topic is quite good. TL/DR: It appears to be ballistic droplet spread (as opposed to truly airborne). And that's suggestive.https://quillette.com/2020/04/23/covid-19-superspreader-events-in-28-countries-critical-patterns-and-lessons/ …
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The automatic doors probably effectively separate the floor into two pockets of air. Attack rate of ~.8 in the upper one :/
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Additionally, even with a 24h turnaround on building closure and 15k or followup, it's unclear that any cases were prevented in the cluster -- to first approximation there were no presymptomatic pts when they closed (fig 1).pic.twitter.com/upe9X83FIG
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Just as an anti-thesis to "more time together = higher infection likelihood": Could also be that they had more 1on1 conversations (speaking in close proximity).
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Study of
) sat on the same side of the floor.