Researchers are exploring the possibility that the omicron variant of the coronavirus may have originated in an animal host, with some suggesting a mouse could have been the initial host. The idea that omicron evolved in an animal is being considered by experts, although the specifics, including the type of animal, are still uncertain. Studies on animals, including mice, and their relationship to SARS-CoV-2 are ongoing, with some research focused on the virus's adaptation and transmission in different hosts.