I don’t see how it can be proven that the vet caught the virus from the cat unless the vet had no contact with another human being for the period immediately before the cat sneezed in their face, up to the time that they themselves were diagnosed.
it’s one possibility of course, but likelihood is that there are other possible sources from which the vet might have contracted Covid.
i put this one in the file along with the cancer cure and other Thailand firsts.