Cat Feline Infectious Peritonitis and Welfare

FIP is a devastating disease of cats caused by mutated feline coronavirus. Recent antiviral treatment breakthroughs have transformed outcomes, offering hope where previously there was none.

Key Facts

FIP is caused by a mutated form of feline enteric coronavirus that becomes virulent in some cats
Before antivirals, FIP was almost universally fatal within weeks to months of diagnosis
GS-441524 and other antiviral drugs achieve remission in over 85% of treated cats
Treatment courses typically last 12 weeks and require careful monitoring
Wet FIP with fluid accumulation was previously considered the most rapidly fatal form
Young cats, particularly in multi-cat environments, are most commonly affected

Welfare Considerations

FIP was one of the most devastating diagnoses in feline medicine because it meant certain death, usually rapidly and with significant suffering. The development of effective antiviral treatments represents a transformative welfare advancement. Cats that previously would have died in weeks with maximum supportive care now achieve remission and live normal lives. The welfare challenge now is ensuring access to treatment, which remains expensive and in some countries requires navigating regulatory pathways. Early diagnosis and prompt treatment initiation yields better outcomes. The transformation from universally fatal to highly treatable represents one of the most significant advances in companion animal medicine in recent decades.

What You Can Do

Be aware of FIP signs including weight loss, fever, fluid accumulation, and neurological symptoms in young cats
Seek veterinary evaluation promptly if FIP is suspected as early treatment improves outcomes
Discuss antiviral treatment options with a feline specialist if FIP is diagnosed
Support access to affordable FIP treatment through advocacy and support of feline health organizations