Cat Infectious Peritonitis: Hope from Antiviral Treatment Revolution

Feline infectious peritonitis (FIP), once considered a death sentence for cats, has been transformed by antiviral treatments achieving cure rates exceeding 85%, representing one of veterinary medicine's great breakthroughs.

Key Facts

FIP is caused by a mutation of feline coronavirus that creates an inflammatory cascade throughout the body
Two major forms exist: wet (effusive, with fluid accumulation) and dry (granulomatous lesions in organs)
FIP historically had near 100% mortality - it was considered completely incurable
GS-441524 and GC-376 antivirals were discovered to achieve remission in controlled studies
Regulatory approval lagged market availability - treatment was initially only accessible via gray market
Remdesivir (a prodrug of GS-441524) received attention as human COVID-19 treatment
USCITA and similar patient advocacy organizations fought for veterinary access to these drugs
Licensed FIP treatments have now received approval in multiple countries including the US (Bova and Elanco products)
Treatment courses of 12 weeks achieve 85-90% sustained remission (functional cure) in treated cats

Welfare Considerations

The FIP antiviral revolution is one of the most profound welfare advances in feline medicine: a diagnosis that previously meant immediate euthanasia now offers a strong chance of cure. Cats that would have died in weeks now live full lives. The remaining welfare challenges include treatment cost (several thousand dollars for a full course), availability disparities between countries, and identifying cases early enough for treatment. Owner awareness that FIP is now treatable rather than fatal is itself a critical welfare intervention - ensuring cats are treated rather than euthanized at diagnosis.

What You Can Do

Learn that FIP is now treatable - a diagnosis no longer means immediate euthanasia
Seek veterinary specialist consultation if your cat is diagnosed with FIP to discuss antiviral treatment
Explore the Bova FIP treatment or equivalent licensed products in your country
Connect with EveryCat Health Foundation and FIP Warriors for treatment support and resources
Donate to organizations funding antiviral access programs for cats whose owners cannot afford treatment
Advocate for veterinary drug access policies that make licensed FIP treatments affordable globally