Q. My nephews kitten has fip and he comes to my house after petting his kitten and then comes into contact with my older cats. Can they get it from him
DR. CHRISTIE LONG, D.V.M., C.V.A.
A. No, it's unlikely. FIP is a very unusual disease, and while cats can pass the virus that causes it (a corona virus) between them something has to occur in the cat's body for them to then become sick from it. The virus undergoes a mutation and then the cat becomes sick from it. But many cats have the virus in their bodies and never become sick.
And without direct contact between the FIP kitten and your cats, there's no way it could be transmitted. It is passed thorough direct contact with feces or saliva, or cross-placentally (from the mother to the kittens in utero)