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Feline Infectious Peritonitis

Feline enteric coronavirus (FeCV) is a common disease of wild and domestic cats that is caused by a member of the coronavirus group. The disease is spread from cat to cat, but requires close and continuous contact with infective secretions. The incubation period is two to three weeks or longer, but 75 percent of cats exposed experience no apparent infection. Among those who do, a mild respiratory infection, with a runny nose or eye discharge, is the most common sign.

Cats who recover from mild infection can become asymptomatic carriers. Most cats who have been infected in this way are not immune to future infections with the coronavirus. It is estimated that 30 to 40 percent of all cats are positive for antibodies to FeCV, with that rising to 80 to 90 percent in catteries.

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Fewer than 1 percent of all exposed cats will develop the secondary fatal disease known as feline infectious peritonitis (FIP). Why some cats develop FIP and others do not is not known for sure. It is believed that FIP is a mutation of the benign coronavirus and is therefore not contagious. The virus may change from benign to virulent weeks, months, or even years after the initial exposure to the coronavirus. Factors that seem to play a part in the change from benign to virulent are a genetic predisposition, exposure to chronic shedding of the virus, and living in a multicat environment, which could mean more stress.

It is known that FIP tends to most often affect kittens, cats between 6 months and 2 years of age, and cats older than 14 years of age. Neonatal FIP has been implicated as a cause of fading kittens. There is a higher rate of infection in catteries, where conditions are apt to be crowded and there is greater opportunity for continuous and prolonged exposure. Cats who are poorly nourished, run-down, or suffering from other illnesses, such as feline leukemia, are most susceptible. These factors may lower the cat’s natural resistance to FIP.

Despite its name, FIP is not strictly a disease of the abdominal cavity. The virus acts on capillary blood vessels throughout the body-especially those of the abdomen, chest cavity, eyes, brain, internal organs, and lymph nodes. Damage to these minute blood vessels results in loss of fluid into tissues and body spaces. FIP tends to run a prolonged course. It may go on for weeks before signs are evident.

FIP occurs in two forms-wet and dry-both of which are invariably fatal.

Wet form early signs are nonspecific and mimic several other feline disorders. They include loss of appetite, weight loss, listlessness, and depression. The cat appears to be chronically ill. As fluid begins to accumulate in the body spaces, you may notice labored breathing from fluid in the chest or abdominal enlargement from fluid in the abdomen. Sudden death may occur from fluid in the heart sac. Other signs that accompany the wet form are fever up to 106°F (41°C), dehydration, anemia, vomiting, and diarrhea. Jaundice and dark urine are caused by liver failure.

WebMD Veterinary Reference from "Cat Owner's Home Veterinary Handbook"

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