Omicron evolved from Beta, which had pretty much bottomed out in the human population. They believe it evolved in mice. Just because Delta is disappearing in the human population doesn't mean it's gone.
Re:Omicron at 100% Prevalence, Colorado
by robocat on Thursday January 06, 2022 @05:34PM
(#29831443)
> They believe it evolved in mice.
https://pubmed.ncbi.nlm.nih.gov/34954396/
https://www.newshub.co.nz/home/world/2022/01/coronavirus-omi...
If Omicron is reaching 100% prevalence in so many locations, I wonder if Delta will not be as much of a threat anymore? It seems like there haven't been any infections with older variants for a long time now.