Strong evidences that Omicron is coming from mouses
" The genetic changes seen happened at a rate far 3.3x faster than expected in humans.
Mutations in the spike protein, which are likely to depend on which animal is best infected, were a far closer match in mice than any of 20 other species tested (P<1.6x10-11 )
The types of genetic changes (ie. transitions from one base to another) were not those expected to be found in human cells, but were those expected to be found in mouse cells (P<0.008)
Omicron binds far better to mouse cells receptors than any other animal or human tested (P<1x10-5 )
my summarization has traded scientific accuracy for simplicity
Any of those last 3 bullet points I would consider pretty decisive evidence. To have found all three is amazing.
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https://www.reddit.com/r/science/comments/rua6jb/evidence_for_a_mouse_origin_of_the_sarscov2/Doesn't change much things but this also means "bad" mutations from covid can emerge from time to time in the same way than flu does (ie: like the terrible fear of avian flu pandemic)
=> Many domestic and wild animals are actually massively infected by Covid.
Same scenario than CyberPunk2077 where cats and dogs are restricted in town and all wild animals are eliminated in a radius of several kilometers.