Transmission and Infection
FECV is very common, especially in places where large groups of cats are kept together (animal shelters, catteries, etc.). Cats become infected by inhaling or ingesting the virus. The most commonly cited transmission source is feces, although contaminated surfaces such as food dishes and clothing can transmit the virus as well.
Despite the prevalence of FECV, most infected cats do not develop FIP. Often, exposure to FECV produces no clinical signs, but may cause a mild diarrhea. Therefore, a cat without clinical signs may still be an FECV carrier and may pass the virus to another cat. In any cat infected with FECV there is a chance that the virus may mutate into the FIP causing form. This chance is increased for cats that are immune-compromised, including very young and very old cats. There is also thought to be a genetic component to susceptibility to viral mutation.
Read more about this topic: Feline Infectious Peritonitis
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