The suspicion was that Spanish Flu set off cytokine storms in young people with robust immune systems.
This doesn't seem to be happening with Covid-19.
The first wave was very similar to the standard flu. Fairly mild, primarily killed the elderly and sick. It first appeared around January.
The 2nd wave is what killed young people. It didn't show up until August.
The suspicion was that Spanish Flu set off cytokine storms in young people with robust immune systems.
This doesn't seem to be happening with Covid-19.