Feline Infectious Peritonitis: Welfare and Treatment Advances

Feline infectious peritonitis (FIP) was historically a uniformly fatal disease, but antiviral treatments now offer hope for many affected cats.

Key Facts

FIP is caused by mutation of feline coronavirus within the cat's own body
Wet (effusive) and dry (non-effusive) forms have different presentations
Young cats under 2 years and over 10 years are most commonly affected
Antiviral drugs GS-441524 and molnupiravir now provide effective treatment
Treatment courses typically last 84 days with high success rates in uncomplicated cases

Welfare Considerations

FIP caused immense suffering and grief — previously, diagnosis was effectively a death sentence. The emergence of antiviral treatments has transformed welfare outcomes for many affected cats. However, treatment access remains expensive and unevenly available globally. Welfare during treatment requires careful monitoring and supportive care. Some forms, particularly neurological FIP, remain harder to treat. Early diagnosis and rapid initiation of treatment are critical to outcome.

What You Can Do

Learn FIP signs — weight loss, fever, fluid accumulation, neurological changes
Seek specialist veterinary opinion if FIP is suspected — treatments now exist
Advocate for affordable access to FIP antivirals globally
Support cat welfare organisations providing treatment funding for owners who cannot afford it
Neuter cats to reduce coronavirus spread within multi-cat households