Here dejavu from CTMedic, https://www.biorxiv.o
Post# of 148172
https://www.biorxiv.org/content/10.1101/2021.12.14.472632v1
This portion particularly...
"Collectively, our results suggest that the progenitor of Omicron jumped from humans to mice, rapidly accumulated mutations conducive to infecting that host, then jumped back into humans, indicating an inter-species evolutionary trajectory for the Omicron outbreak.”
chazzle