Feline infectious peritonitis is associated with a mutated version of a pathogen known as feline enteric coronavirus. FECV is found in the feline intestinal tract, and in its typical form it causes few if any symptoms, writes veterinarian Jeff Kahler. FIP, however, is a serious, often fatal condition that can occur shortly after exposure to FECV, or it may not surface for years, causing disease when a mutation occurs.

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