There are also some effects on viral transmission from environmental variables like temperature, UV, CO2, wind, etc., which vary with season. But in terms of being "seasonal" a la flu and RSV, no, so it's important to consider all the relevant factors.
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Number 3-Human Behavior!
In 2022 doctor agrees with me about Covid being dependent on human behavior. In 2024, we debate about the need for respirators in the no respiratory illness hall of the clinic (checkin-line of patients at other end of hall.)
I won.