FIP stands for feline infectious peritonitis, which is a lethal viral disease that affects cats. It is caused by a virus called feline coronavirus which is closely related to the virus that causes the common cold in humans. This virus is highly contagious and can be spread through contact with an infected animal's feces, saliva, or nasal secretions.

Symptoms of FIP can vary widely, but may include fever, loss of appetite, weight loss, vomiting, diarrhea, fluid accumulation in the abdomen, and changes in behavior. In some cases, the virus can cause neurological problems such as seizures, paralysis, and even death.

Treatment for FIP is limited, as there is no effective antiviral drug available. Management of the disease includes supportive care such as providing fluids and antibiotics to combat secondary bacterial infections. In some cases, cats may be able to recover with supportive care, but the virus is usually fatal.

Cats at risk for FIP include those that are immunocompromised, such as those that are very young or old, as well as those living in overcrowded environments or those with other illnesses. Vaccines are available to protect cats from the virus, but the vaccines may not be effective in some cats.

It is important to take steps to prevent FIP in cats, such as limiting contact with other cats, keeping cats indoors, and avoiding contact with cats that may be infected. It is also important to seek prompt veterinary care if your cat shows any signs of FIP.