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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Feline infectious peritonitis (FIP) is a serious disease associated with certain feline coronavirus infections, but a cat that has feline coronavirus does not necessarily have FIP. Signs can be vague at first, and no single test confirms the disease. If your cat has persistent fever, appetite or weight loss, a swollen abdomen, breathing difficulty, or new coordination problems, contact a veterinarian promptly; suspected FIP needs veterinary evaluation and monitoring.
What causes FIP in cats?
FIP develops in a small proportion of cats infected with feline enteric coronavirus, a common virus that usually affects the gastrointestinal tract without causing significant illness. Cornell Feline Health Center estimates that about 10% of cats infected with feline enteric coronavirus develop FIP. In those cases, viral mutations can change how the virus behaves, allowing it to infect white blood cells and spread through the body. The resulting inflammation around affected blood vessels contributes to disease. This is not the same as saying every coronavirus-positive cat has FIP or that FIP spreads between cats just like ordinary feline coronavirus. Cornell explains the disease process and its limits.
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FIP is seen disproportionately in young cats, but age alone cannot diagnose it. Cornell’s page, updated in 2024, reports that approximately 70% of diagnosed cases are in cats younger than 1.5 years and 50% are in cats younger than seven months. These are estimates reported by Cornell, not a guarantee of an individual cat’s risk or a new population survey.
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What symptoms can FIP cause?
FIP may appear as effusive (“wet”) disease, noneffusive (“dry”) disease, or a presentation that changes over time. Either form can start with nonspecific signs such as loss of appetite, weight loss, low energy, or fever. Those symptoms have many possible causes, so a checklist cannot confirm FIP.
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Effusive (wet) FIP
Fluid may accumulate in the abdomen or chest. Abdominal fluid can make the belly look enlarged or pot-bellied; fluid in the chest can interfere with breathing. Breathing difficulty warrants prompt veterinary attention.
Noneffusive (dry) FIP
Signs may develop more gradually and vary with the areas affected. Neurologic problems can include uncoordinated movement or seizures. Wet and dry presentations can evolve into one another, so the terms do not always describe a fixed course.
How is FIP diagnosed?
There is no single definitive FIP test. A coronavirus antibody test can indicate previous exposure, but it cannot distinguish ordinary feline enteric coronavirus exposure from the FIP-associated disease process. A positive antibody result alone therefore does not establish FIP.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallA veterinarian considers the cat’s signs and clinical context alongside other findings to reach a presumptive diagnosis. Because early symptoms are nonspecific and test results need interpretation in context, veterinary assessment is essential. Cornell’s FIP overview describes the diagnostic limitations.
Can FIP be treated?
GS-441524 is a studied treatment option. Cornell reports support from laboratory studies and studies in client-owned cats, while noting unresolved questions about long-term effectiveness, the minimum effective dose, resistance, and which antiviral approach is best. Treatment decisions, prescription, and monitoring belong with a veterinarian. Do not use a general article to choose a drug or dose for an individual cat.
Care may also include supportive measures such as fluid therapy, drainage of accumulated fluid, or blood transfusions in some cases. What is appropriate depends on the cat’s condition and veterinary assessment. When discussing options with the practice, ask how the plan accounts for the disease presentation, including possible neurologic involvement; the formulation and route; evidence and remaining uncertainty; prescription and regulatory status where you live; monitoring and follow-up; and confirmed availability and cost.
What the U.S. regulatory position means
In a statement dated May 10, 2024, the U.S. Food and Drug Administration’s Center for Veterinary Medicine said it did not intend to enforce new animal drug approval requirements for products compounded from GS-441524 when a veterinarian prescribes them for a specific cat with FIP under the conditions in Guidance for Industry #256. This is enforcement discretion, not FDA approval of a compounded product. The FDA explicitly says compounded drugs made from bulk substances are unapproved drugs; the enforcement position does not make them FDA-approved. Read the FDA’s May 10, 2024 statement for the conditions and explanation.
Cornell’s U.S. update reported that Stokes Pharmacy, working with Bova Group, announced an oral compounded GS-441524 formulation would be available starting June 1, 2024, with a veterinary prescription required. That was a dated availability announcement, not a guarantee of current stock or a recommendation for a particular pharmacy. Ask your veterinarian about current access and the rules that apply in your location. Cornell’s FIP page provides the update.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you prevent FIP?
Preventing FIP is difficult because feline coronavirus is widespread. The virus commonly spreads through feces and oral exposure, so household hygiene can help manage exposure, but it cannot guarantee that a cat will not develop FIP. Cornell recommends keeping litter boxes clean and placing them away from food and water. It also notes a recommendation to house no more than three cats per room to reduce crowding-related stress.
FIP itself is not believed to spread between cats in the same way as ordinary feline coronavirus, although understanding may change as research develops. Cornell says the only definitive way to prevent FIP would be to prevent feline coronavirus infection, which is difficult given how widespread the virus is.
What about the FIP vaccine?
Cornell reports that one FIP vaccine is licensed, but its effectiveness is questionable and the AAFP Feline Vaccine Advisory Panel does not routinely recommend it. Discuss whether vaccination is appropriate for your cat with your veterinarian rather than assuming it will prevent FIP. See Cornell’s prevention guidance.
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