FIP Survival Rates in 2026: What the Evidence Shows

Key takeaway: Feline Infectious Peritonitis (FIP) is now a treatable disease, and the strongest published numbers come from GS-441524 based antiviral therapy. GS-441524 monotherapy reported a 92% success rate at UC Davis (Pedersen, 2019), while dual antiviral therapy combining GS-441524 with EIDD-1931 reported 78.3% remission (Li and Cheah 2025). These are two separate figures tied to two different protocols, and they should never be blended into a single number.

What is the FIP survival rate in 2026?

The FIP survival rate in 2026 reflects two distinct, product-matched figures: a 92% success rate for GS-441524 monotherapy (Pedersen, UC Davis, 2019) and a 78.3% remission rate for dual antiviral therapy using GS-441524 plus EIDD-1931 (Li and Cheah 2025). FIP was once considered almost uniformly fatal, and the shift to these outcomes is the result of antiviral treatment built around GS-441524.

These numbers matter because prognosis used to be the hardest conversation a caregiver could have. Today, evidence shows that with timely diagnosis and a full course under veterinary supervision, most treated cats reach remission.

Across the CureFIP network, more than 100,000 cats have been treated since 2019. That scale gives caregivers in Australia and New Zealand a clearer picture of what a structured 84-day protocol looks like in practice.

Why is GS-441524 central to FIP survival?

GS-441524 is the antiviral at the core of modern FIP treatment, and it is the hero ingredient behind every CureFIP protocol. It is the active compound in the 92% success rate reported by UC Davis (Pedersen, 2019), and it remains the foundation whether a cat receives injectable monotherapy or a dual antiviral capsule approach.

GS-441524 works by interfering with viral replication, which gives the cat's immune system the window it needs to recover. Evidence shows that consistent daily dosing across the full course is what drives outcomes, not a short burst of treatment.

If you are still confirming a diagnosis, our guide on cat FIP symptoms explains the early signs to watch for, and our overview of how FIP progresses from infection to symptoms shows why early treatment supports better survival.

How do the two main survival figures compare?

The two headline figures come from two different treatment approaches, and matching the right number to the right protocol is essential. The table below keeps each statistic with its own source so the figures are never mixed or averaged.

Approach	Reported outcome	Source
GS-441524 monotherapy (injectable)	92% success rate	Pedersen, UC Davis, 2019 (PMC6435921)
Dual antiviral (GS-441524 + EIDD-1931)	78.3% remission	Li and Cheah 2025

The 92% figure describes GS-441524 monotherapy delivered as a daily injectable course. The 78.3% figure describes a dual antiviral protocol that pairs GS-441524 with EIDD-1931.

A lower percentage in one study does not automatically mean one route is better or worse for your cat. Study populations, FIP forms, and case severity differ, which is why your veterinarian helps choose the route that fits your cat's specific situation. You can read more about why many caregivers explore the combined route in our piece on dual antiviral therapy for FIP in Australia.

Does the form of FIP affect survival and dosing?

Yes. FIP takes four forms, wet, dry, ocular, and neurological, and each shapes both the clinical picture and the dosing plan. The injectable dose rises with the forms that are harder to reach, and the four subsections below mirror the four-row dosing structure.

Wet (effusive) FIP

Wet FIP causes fluid to build up in the abdomen or chest, often leading to a swollen belly or laboured breathing. For the GS-441524 Antiviral Injectable, the catalog lists a wet FIP dose of 6 mg/kg, given as 1 subcutaneous injection per day, 7 days a week, for 12 weeks (84 days).

Wet FIP is frequently the fastest moving form, which makes prompt veterinary diagnosis important for survival.

Dry (non-effusive) FIP

Dry FIP develops without significant fluid accumulation and can be harder to spot, with vague signs such as weight loss, fever, and lethargy. The catalog lists a dry FIP dose of 8 mg/kg for the GS-441524 injectable, given once daily by subcutaneous injection across the full 84-day course.

Because dry FIP can be subtle, it is sometimes mistaken for other illnesses, a topic we cover in common FIP misdiagnoses.

Ocular FIP

Ocular FIP affects the eyes, with signs such as colour changes in the iris, cloudiness, or vision problems. The catalog lists an ocular FIP dose of 10 mg/kg for the GS-441524 injectable, given as one daily subcutaneous injection for 12 weeks.

The higher dose reflects the need to reach tissues that are more difficult for antiviral treatment to penetrate.

Neurological FIP

Neurological FIP affects the brain and spinal cord, and signs can include wobbliness, seizures, or behaviour changes. The catalog lists a neurological FIP dose of 10 mg/kg for the GS-441524 injectable, given once daily by subcutaneous injection across the 84-day protocol.

Neurological and ocular cases need the highest injectable doses because the virus is harder to reach in these sites. Your veterinarian will confirm the right plan for your cat.

What does a full FIP treatment course look like?

A standard FIP treatment course runs 84 days (12 weeks) under veterinary supervision, with daily dosing throughout. Consistency across the entire course is one of the strongest factors behind the published success and remission figures.

A typical journey looks like this:

1. Confirm the FIP form with your veterinarian (wet, dry, ocular, or neurological).

2. Begin daily GS-441524 dosing at the dose matched to the form and your cat's weight.

3. Monitor weight, appetite, and clinical signs throughout the 84 days.

4. Complete the full course even if your cat looks well before day 84.

5. Move into the post-treatment observation period your veterinarian recommends.

The first week often brings the most visible changes, and our guide on what to expect during your cat's first week on GS-441524 walks through what is normal.

Which products are used, and what do they cost?

CureFIP offers GS-441524 injectables in two strengths plus capsule options, with prices listed in AUD. The table below pulls the product names, strengths, and prices directly from the live catalog.

Product	Strength	Price
GS-441524 Antiviral Injectable, 8ml	20 mg/ml	AU$79.00
GS-441524 Antiviral Injectables, 8ml	30 mg/ml	AU$99.00
CureFIP Oral Capsules - Dual-Action Formula	GS-441524 + EIDD-1931	AU$139.00
EIDD-1931 Oral Capsules	60 capsules per bottle	AU$39.00

The injectables are available With B12 or Without B12. The CureFIP Oral Capsules - Dual-Action Formula is dosed by weight band: under 2.5 kg uses GS-441524 25 mg plus EIDD-1931 5 mg, 2.5 to 5 kg uses GS-441524 35 mg plus EIDD-1931 8 mg, and over 5 kg uses GS-441524 50 mg plus EIDD-1931 12 mg, taken as 1 capsule per day for 12 weeks.

Note that the oral dual route is positioned for wet and dry FIP, and some regions note it is not recommended once ocular or neurological signs are present, or when a cat cannot eat or defecate. Your veterinarian is the right person to confirm the route and product for your cat.

What improves a cat's chances of survival?

The biggest drivers of survival are early diagnosis, completing the full 84-day course, and steady supportive care alongside the antiviral. Evidence shows that cats who finish the entire protocol under veterinary supervision tend to do better than those whose treatment is cut short.

Key factors that support outcomes include:

• Starting treatment promptly after diagnosis.

• Dosing every day at the correct dose for the FIP form and current weight.

• Maintaining appetite and nutrition throughout treatment.

• Tracking weight and clinical signs and reporting changes to your veterinarian.

• Following the recommended post-treatment observation period.

Nutrition is a practical lever many caregivers can act on, and our appetite support feeding advice offers realistic tips. After the course ends, our guide on supporting your cat's recovery after FIP treatment explains what the watch period involves.

Is FIP curable, and what does remission mean?

FIP is now treatable, and the clinical goal is remission, meaning the disease is no longer active and the cat returns to normal health. Remission is the term used in the published evidence, including the 78.3% remission reported for dual antiviral therapy (Li and Cheah 2025), and it reflects sustained recovery rather than a single moment.

We are clear about what the data shows and what it does not. A small number of cats relapse, which is why the observation period matters, and our article on understanding FIP relapse explains the signs and next steps. To see what recovery looks like in real cats, our collection of FIP treatment success stories shares caregiver experiences.

FAQ

What is the survival rate for FIP with treatment?

With GS-441524 monotherapy, UC Davis reported a 92% success rate (Pedersen, 2019), and dual antiviral therapy combining GS-441524 with EIDD-1931 reported 78.3% remission (Li and Cheah 2025). These are two separate figures tied to two different protocols and should not be averaged.

How long does FIP treatment take?

A standard FIP treatment course runs 84 days (12 weeks) of daily dosing under veterinary supervision. Completing the full course is one of the most important factors behind the published outcomes, even if your cat looks well sooner.

Does the type of FIP change the dose?

Yes. For the GS-441524 injectable, the catalog lists 6 mg/kg for wet FIP, 8 mg/kg for dry FIP, and 10 mg/kg for both ocular and neurological FIP, all given as one daily subcutaneous injection across 84 days. Your veterinarian confirms the dose based on the form and your cat's weight.

How much does FIP treatment cost in Australia?

In AUD, the GS-441524 Antiviral Injectable (20 mg/ml, 8ml) is AU$79.00, the 30 mg/ml 8ml injectable is AU$99.00, the CureFIP Oral Capsules - Dual-Action Formula is AU$139.00, and EIDD-1931 Oral Capsules are AU$39.00. Total course cost depends on your cat's weight, FIP form, and treatment length, which your veterinarian can help estimate.

Can FIP come back after treatment?

Most treated cats reach remission, but a small number relapse, which is why a post-treatment observation period is recommended. Report any returning signs to your veterinarian promptly so the situation can be assessed.

If your cat has been diagnosed with FIP, the next step is to understand your options and build a plan with people who know the protocol. You can explore CureFIP's FIP treatment options for Australia and New Zealand and then talk through the right approach with our team and your own veterinarian, who will guide every medical decision for your cat.