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Seasonality of #COVID is underappreciated.  Most human viral disease occur in distinct cycles. This is especially true for respiratory infections. We don´t know the reason for this, but it´s NOT simply “the weather”.

Regular seasonal variance is the rule, not the exception!

This great paper from 2001 discussrs different theories about this topic.
In a double-blind placebo-controlled trial conducted, nonimmune volunteers were given attenuated live influenza vaccine intranasally. Febrile reactions were observed in 6.7% of 360 volunteers inoculated in Leningrad in January, compared with 0.8% of 197 in June.
Fourfold rises in antibody titer were seen in 31% to 40% in Krasnodar in January, depending on the vaccine strain, compared with 4.3% to 4.8% given the same strains in May and October (all p <0.001)
Some years earlier, in a series of experiments on the transmission of influenza virus from infected to susceptible mice, <1% of mice exposed from July to October were infected, compared with 22% of those exposed in December or January (p <0.001) (56).
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