FIP Prognosis and Life Expectancy in Cats
- CURE FIP™ USA
- Apr 21
- 3 min read
Feline Infectious Peritonitis (FIP) was once considered a death sentence for cats. But recent advancements in treatment—especially the use of antiviral medications like GS-441524—have dramatically changed the outlook for many cats diagnosed with this disease.
This article breaks down the prognosis and life expectancy of cats with FIP, helping pet parents understand the factors that affect outcomes and how to improve them.
What is FIP? A Quick Overview
FIP is caused by a mutation of the feline coronavirus (FCoV). While most cats carry the benign version of this virus, a small percentage—typically less than 10%—develop the mutated, deadly form known as FIP.
There are two main types of FIP:
Wet (effusive) FIP – Characterized by fluid buildup in the abdomen or chest.
Dry (non-effusive) FIP – Affects organs like the liver, kidneys, eyes, or brain without fluid accumulation.
Both forms can be fatal without treatment.
FIP Prognosis Without Treatment
Historically Poor Survival Rate
Before antiviral therapies became available, the prognosis was extremely poor.
Most cats diagnosed with FIP died within days to a few weeks of diagnosis, especially with the wet form.
A 2002 Cornell study reported nearly 100% fatality rates in untreated FIP cases.
FIP Prognosis With Treatment (GS-441524)
How GS-441524 Changed Everything
GS-441524 is a nucleoside analog developed by Gilead Sciences (and studied at UC Davis) that stops the virus from replicating.
The first documented success came in 2018 through a UC Davis clinical trial with promising remission rates.
Survival and Remission Rates
Success rates now reach 80% to 90% in cats that receive full treatment protocols.
CureFIP and other GS-441524-based treatments have become global standards for managing FIP effectively.
Key Factors That Influence Prognosis with Treatment
Factor: Influence on Prognosis
Early Diagnosis: Better response to treatment
Type of FIP: Dry form often responds slightly better
Neurological Involvement: More challenging, but remission is still possible
Overall Health of the Cat: Younger, stronger cats recover faster
Owner Adherence to Protocol: Skipped doses or incomplete treatment can cause relapse
Life Expectancy After Treatment
Cats that complete GS-441524 treatment and enter remission are often able to live full, healthy lives. Some key points:
Post-remission survival: Many cats live multiple years or even normal lifespans with no recurrence.
Relapse: Roughly 10% of cats relapse; most respond well to a second round of treatment.
Long-term monitoring: Periodic bloodwork is recommended for at least 6 months post-treatment.
FIP Life Expectancy by Type
1. Wet (Effusive) FIP
Without treatment: Life expectancy is as short as 5–14 days post-symptom onset.
With treatment: 80–90% survival rate. Cats often show improvement within 3–5 days of starting GS-441524.
2. Dry (Non-effusive) FIP
Without treatment: Life expectancy varies from weeks to months depending on organ involvement.
With treatment: It also shows up to 90% recovery rates, particularly with early intervention.
3. Neurological FIP
Most severe form of FIP.
Without treatment: There is a rapid decline within days to weeks.
With treatment: Recovery rates vary (about 60–70%), but still improving as protocols evolve.
What Determines a Good Prognosis?
1. Early Diagnosis
Catching FIP before extensive organ damage increases the chance of remission.
2. Accurate Diagnosis
Using tools like:
Rivalta test (for effusive FIP)
PCR or RT-PCR (to detect FCoV RNA)
MRI or CSF analysis (for neurological FIP)
3. Full Treatment Course
Standard GS-441524 protocols recommend:
84 days of antiviral injections or capsules
Followed by 84 days of observation
Dosage varies by weight and FIP form (e.g., higher doses for neuro FIP).
Frequently Asked Questions (FAQ)
Can cats be cured of FIP?
Yes. While "cure" is a strong word in medicine, many cats achieve full remission and live healthy lives after completing antiviral treatment.
Is FIP contagious?
FIP itself is not contagious, but the feline coronavirus (FCoV) that mutates into FIP can spread between cats. Good hygiene and litter box management reduce risk.
How much does treatment cost?
Costs vary by weight, severity, and supplier. Expect:
$1,500–$3,000 for a full 84-day course for an average-weight cat.
Final Thoughts: Hope for FIP Cats is Real
A diagnosis of FIP used to be a heartbreaking certainty. But today, thanks to GS-441524 and ongoing global research, many FIP-positive cats are being saved.
At CureFIP USA, we are committed to providing the latest treatment options and accurate information to help your cat beat FIP.
Sources and Trusted References:
Cornell University Feline Health Center
UC Davis Veterinary Medicine
VCA Hospitals FIP Guide
PetMD
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