FIP in cats: updated diagnosis and management

Knowledge about FIP has changed. Diagnosis and treatment can no longer be described using the absolute statements found in older guides.

Feline coronavirus and FIP

Exposure to feline coronavirus is common, but it does not automatically mean FIP. The disease results from a complex process rather than a single behavioural cause.

General, ocular or neurological signs, or the presence of an effusion, require expert assessment.

Diagnosis

There is not always a single conclusive test. The veterinarian combines clinical examination, laboratory tests, diagnostic imaging and analysis of appropriate samples.

Diagnosis must not be described as possible only after death.

Current treatment landscape

Evidence on antiviral medicines has changed management and prognosis, but access, authorisation and legal routes vary between countries. Dosages and unauthorised channels are not published.

Sources and document updates

This information is general and does not replace diagnosis, prescription or instructions from a veterinarian. For a medicine, the summary of product characteristics or package leaflet for the specific presentation is authoritative.

• European Advisory Board on Cat Diseases — Feline infectious peritonitis guideline, 2025 update (accessed 24/07/2026)
• Union Product Database — Veterinary medicines authorised in the European Union (accessed 24/07/2026)

Editorial transparency: sources are provided to allow the documents to be checked. Professional review is only declared after genuine approval by a qualified, identifiable person.