The virus is so 'well-calibrated' that explaining such differences seems to involve any and all factors: age, culture, weather, stress, immune responses, luck... It's like an infinite series approximation where the first two terms are zero.https://twitter.com/zeynep/status/1258549915745087488 …
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Well said; that indeed is an important puzzle.
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I'll say this one last time: buildings with shared or recirculated air are where almost all the clusters come from. Some countries have lots of such structures. Some have very few. The key to the mystery is HVAC.
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