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Cats of all ages and either sex can develop the disease, but incidence is highest in cats 6-24 mo old, decreased in cats 5-13 yr old, and increased in those 14-15 yr old. Kittens raised in infected colonies may contract the virus from their mothers or asymptomatic carriers when their maternal immunity wanes at 5-10 wk of age. These kittens typically may develop FIP weeks or months after they are placed in new homes. The prevalence of clinical FIP is
The Merck Veterinary Manual -Feline Infectious Peritonitis and Pleuritis: Introduction