Cat Feline Infectious Peritonitis and Emerging Treatments

Feline Infectious Peritonitis (FIP) was until recently almost universally fatal, but new antiviral treatments have transformed it from a death sentence into a treatable condition for many cats.

Key Facts

FIP is caused by a mutated form of feline coronavirus and was almost 100% fatal before 2019
GS-441524, an antiviral compound, achieves remission in over 85% of FIP cats when given for 84 days
The treatment was initially only available in unlicensed forms at high cost through grey markets
Licensed FIP treatments received regulatory approval in Europe and the UK from 2023 onward
FIP affects cats of all ages but is most common in young cats under 2 years old in multi-cat environments

Welfare Considerations

The transformation of FIP from a fatal disease to a treatable condition represents one of the most significant recent advances in companion animal welfare. Before antiviral treatment, a FIP diagnosis meant euthanasia within days to weeks, often in young cats. The welfare impact of treatment - 84 days of daily oral or injectable medication - is significant but far outweighs the alternative of euthanasia or untreated disease. Treatment cost remains a welfare barrier for some owners, underscoring the importance of pet insurance covering emerging treatments. Early diagnosis and prompt treatment initiation improve outcomes significantly.

What You Can Do

Ensure your cat is insured for specialist veterinary treatment including emerging diseases like FIP
If your cat is diagnosed with FIP, consult a specialist vet about antiviral treatment options
Support veterinary research funding that enables breakthrough treatments like FIP antivirals
Advocate for licensed FIP treatments to be covered under standard veterinary insurance policies
Share information about FIP treatment breakthroughs with cat-owning friends and communities