Anything is possible but Karen is right, don't borrow trouble. Your vet's staff is probably good about thoroughly cleaning and disinfecting exam tables, etc. Dr. Lee told me that because my cats love lazing on the enclosed patio w/the windows open that, if another cat comes by, they can catch a virus from that cat. And there are two who roam the neighborhood, one of which is in heat (Grrrrrrrr....don't get me started.....I don't want to see a mama w/kittens in my yard. I will NOT be happy.) Try not to worry too much about your furkids. I know it's easy for me to say when you see how sick they are but I'm encouraged by how well Yodie is doing this morning, so I know your kitties will get better, too.