I have mentioned this in some of the other COVID threads – the flu season of 2019-2020 was pretty quiet… but the 2020-2021 season was nonexistent.
Various people have theories – in this specific SciAm article, they think it was due to public health measures. Given the international spread of COVID, the international differences in public health measures, and the international universality of the disappearance of flu… I am skeptical about that explanation.
I think it’s viral interference.
This is from 2015:
A few graphs from the piece: