Can cats get FCV twice?
It’s possible for a cat to suffer from feline calicivirus more than once – even if they’ve previously been vaccinated against it. Feline calicivirus is a highly contagious virus that causes a mild to severe respiratory infection and oral disease in cats. It is especially common in shelters and breeding colonies, and often infects young cats. So, if your cat comes into contact with a cat infected with cup virus, your cat will be infected too.