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What accounts for the recent drop in COVID-19 cases in the US?

Data and Metrics Infection and Spread

Q: It looks like Covid-19 infection rates have dropped significantly in the US since the vaccine became available. Is the vaccine already having an impact? What else would account for the drop?” A: Of all the possible explanations — vaccination, immunity from prior infection, behavior change, seasonality, and less testing — the best answer seems to Read more…