I completely agree with the post above....many cats are exposed to the coronavirus but that in no way means it will become active, much like we are exposed to many virus that never become active. I am not sure why the vet is so focused on it & scaring you. I have seen a great deal of difference working with vets who have experience treating many cats who have been outdoors at some point & feral cat colonies, as oppose to those whose main practice is house cats that have never seen the outdoors. It may just be lack of experience. Hoping Dennis continues to improve!!