The exact cause for flu seasonality is debated. Re: covid, we have a very plausible (not proven) explanation: colder temps everywhere in N. Hemisphere means longer ex vivo viral survival and more indoor gatherings. What's left to explain?
its pretty massively overdetermined and caseloads dont obviously map onto temperature egpic.twitter.com/1iKlZsftdq
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Darkness. Flu season is the wet season in some parts of the world because people congregate in doors.
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this paper seems to suggest this is actually typical of respiratory viruses- i think Europe vs US latitude and timing of outbreaks supports this suppositionhttps://twitter.com/toad_spotted/status/1325893700493447169 …
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Degree of seasonality is determined more by the temporal change in temp, not the absolute temp. Regardless, we don't expect a single cause tracking data perfectly, just a sufficient explanation for general rise at same time. Not sure what you mean by "overdetermined".
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overdetermined => using the list of all plausible mechanisms in replies I believe we have managed to explain 2948% of the variation in infections over time
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