FIP was once fatal - but GS-441524 antiviral achieves ~80% remission in cats for $3,000-$8,000. Caused by mutated feline coronavirus. Strikes cats under 3 and over 10 most often. Progresses rapidly; early diagnosis is critical.
FECV (common coronavirus) infects 40% of cats harmlessly. In 5-10% it mutates into virulent FIPV, invades immune cells, triggers fatal inflammation. Stress, genetics, and immunity influence risk. Mutated coronavirus attacking immune cells
Wet: abdominal or chest fluid, fever, weight loss, lethargy - progresses in weeks. Dry: organ lesions (eyes, brain, kidney), uveitis, seizures, wobbling - slower but harder to diagnose. Fever, weight loss, lethargy common to both
Fluid analysis: high-protein, yellow fluid suggests FIP. Rivalta test (inexpensive). Blood panel: elevated globulins. FCoV PCR. Immunostaining is gold standard. Ultrasound ($300-$500). No single test definitive. Fluid + elevated globulins are key
GS-441524 (Xraphconn, FDA 2024): 84 days daily injections/oral. ~80% remission. Cost: $3,000-$8,000 by weight. Post-treatment: 12-week monitoring - ~10% relapse. ~80% remission with GS-441524
Drug course + diagnostics + monitoring. Neurological FIP may require a higher dose and longer treatment, pushing costs toward $8,000-$12,000.
Persians, Birmans, Ragdolls, and Abyssinians have higher reported prevalence. Cats under 3 and over 10 most at risk. Multi-cat households and catteries increase exposure.
Without treatment: near 100% fatal within days to weeks. With GS-441524: ~80% achieve sustained remission. Neurological FIP has a slightly lower response rate (~70%). Early treatment before severe organ damage improves outcomes.
No reliable vaccine available in the US. Reduce FECV exposure: keep multi-cat groups small, separate litter boxes, reduce stress. Test breeding cats for FCoV status.
02/04
84-day antiviral course + diagnostics + monitoring.
FIP is covered as illness by most policies - not pre-existing if enrolled before diagnosis. FDA approval of GS-441524 (2024) makes coverage more consistent than the prior compounding/import era.
Symptoms before enrollment (weight loss, fever, lethargy) may trigger pre-existing exclusion. Risk alone isn't pre-existing, but documented symptoms create vulnerability.
FIP treatment ($3,000-$8,000 drug + diagnostics) is one of the costliest cat illnesses. Policies with annual limits may cap reimbursement below cost. Verify your limit covers $8,000+.
Standard illness waiting period is 14 days. FIP progresses so rapidly there's no time to enroll after symptoms appear. Enroll kittens early - before any illness.
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My mother-in-law took her German boxer to the veterinary emergency room - $1,200 in tests, no answers. A different vet solved it in minutes with $8 pills.
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