Feline Infectious Peritonitis
Many cat owners have heard of feline infectious peritonitis (FIP) even though the condition is quite rare. FIP is caused by a viral infection. The odd thing about FIP is that most cats are infected with the causative virus (feline coronavirus) when they are young, but only a small proportion of infected cats go on to develop FIP at a later date due to the virus mutating within their bodies.
Cats with FIP can develop a range of symptoms, including poor appetite, lethargy, weight loss, fluid build-up in the abdomen or chest, enlarged lymph nodes, difficulty breathing, eye abnormalities, difficulty walking, behavioral changes, and seizures. Treatment for FIP is limited to supportive therapy.