Feline infectious peritonitis (FIP) is a progressive, systemic and frequently fatal disease of domestic and exotic cats caused by coronaviral infection.FIP is characterized by an insidious onset of persistent fever that is unresponsive to antibiotic treatment, inappetance, gradual weight loss and possibly abdominal enlargement. It is most common in young cats, up to 3 years of age, of either gender and of any breed (although males and purebred Asian breeds, such as the Birman and