Feline Infectious Peritonitis
Feline infectious peritonitis (FIP) is a disease of domestic and wild felidae. It was first described as a specific disease entity by L. G. Wolfe and R. A. Griesemer. FIP has been diagnosed in cats of all ages, but the peak incidence is between 6 months and 5 years of age. The lesions of noneffusive FIP are more typically granulomatous in nature, but nevertheless bear a basic resemblance to the pyogranulomatous lesions of effusive disease. Lymphoid lesions are common in both effusive and noneffusive forms of FIP. A complicating factor in evaluating treatment success is the occurrence of spontaneous remission. Post-mortem examination on older cats without signs of overt FIP have occasionally demonstrated fibrous lesions on the spleen and liver that indicate a past FIP infection. Cats with ocular FIP and no other systemic manifestations have occasionally gone into remission just with topical treatment.