•Whenever FCoV infection exists, so does the potential for FIP development, with a 10% probability in the feline coronavirus infected population. 

•Why some cats are asymptomatic and others develop feline infectious peritonitis (FIP), is unknown but assumed to be caused by a more virulent mutation of FCoV.

•While most cats recover from FCoV infection, some factors could increase the likelihood of FIP developing: 

-Young age (kittens between 3 month - 2 years old)

-A genetic breed tendency 

-The cat’s immune status 

-Stress levels 

-Dose and virulence of the virus

-Crowded environment (multi-cats households, shelters, and catteries)