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sf_sf_sf t1_jdjstg7 wrote on March 24, 2023 at 10:14 PM

Reply to comment by [deleted] in What happened to the old COVID variants, like Delta? Could they come back? by number1dork

There were a couple: Dec 2021 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8702434/

but also a counterpoint https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9111207/

a run down of 3 theories (un detected evolution and transmission, long infection of an AIDS patient, or animal spillover) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8757324/

A good web search is "omicron mouse origin" and you'll see a bunch of papers and articles that are interesting