FIP in a multi-cat home: what to do with the other cats
In a flat with four young cats, one dies of FIP. The other three are healthy. The owner is very worried and asks what she should do with them.
What is the most appropriate recommendation?
chevron_right Show answer and explanation
A. Explain that they have almost certainly already been exposed to feline coronavirus, that FIP arises from mutations within each cat and is hardly transmitted between cats, and advise monitoring, less stress and good litter-tray hygiene
Correct. Enteric coronavirus is very common where several cats live together and is spread in faeces. FIP develops when the virus mutates in a particular cat; the main factors are young age, stress and the viral load in the environment.
B. Test all three for coronavirus antibodies and isolate the positives
Most cats in multi-cat settings are seropositive and the titre does not predict which will develop FIP. Isolating by serology causes stress, which is itself a risk factor.
C. Treat the in-contact cats preventively with GS-441524
There is no indication to treat healthy cats: it has not been shown to prevent FIP and it risks adverse effects and selection of resistance.
D. Vaccinate the in-contact cats with the intranasal FIP vaccine
WSAVA guidelines do not recommend it because of doubtful efficacy, and cats already exposed to coronavirus do not benefit from it.
lightbulb Key takeaway
To reduce coronavirus load: few cats per space, one litter tray per cat plus one, away from food bowls, daily removal of faeces and frequent cleaning. Watch cats under 2 years old most closely, as they are the most often affected.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.