The Delta variant appeared after the first wave of vaccinations in the winter of 2020/2021.
Vaccinations surged in the spring and summer of 2021 (me and probably you if you got the shot), then the Omicron variant appeared in the fall and winter.
I got my booster at the end of last year (you may have too). Then, the current BA.4 and BA.5 variants emerged in the spring of this year.
Thoughts?