What is Feline Immunodeficiency Virus (FIV)?

FIV attacks a cat’s immune system, producing a slow-developing immunodeficiency disease that results in chronic secondary and opportunistic infections. These include respiratory, gastrointestinal, urinary tract, and skin infections, and general unthriftiness. Various cancers may also develop. FIV infection is life long. However, FIV disease is relatively uncommon and most cats remain normal for extended periods until immunodeficiency occurs.