When you have the ability to test and contact trace, you can ascertain COVID problem areas or hot spots. For instance: restaurants, bars, schools, and churches. In WA, +70 cases were linked to the capital protest.https://twitter.com/DrEricDing/status/1259003903393312769 …
A naive model is that the rate of infection goes as density *squared* & it's integrated density over the course of one's week, so it's much sharper in bottlenecks, such as the New York Subway (obviously) and places with bad collective immune systems (hospitals, retirement homes)
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Early infection spreads like wildfire through densely populated cities. If left to its own devices, it also spreads through rural areas who have less access to hospitals and emergency services.
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