This article claims that was the case for H1N1, as well as the "common cold". https://www.gavi.org/vaccineswork/will-covid-19-evolve-be-more-or-less-deadly htt

This article claims that was the case for H1N1, as well as the "common cold". https://www.gavi.org/vaccineswork/will-covid-19-evolve-be-more-or-less-deadly https://www.gavi.org/vaccineswork/will-covid-19-evolve-be-mo...