Common symptoms of feline panleukopenia virus, or feline distemper, include vomiting, weight loss and high fever, reports PetMD. Severe apathy is another early symptom, along with loss of appetite, according to WebMD.
Yellow or bloody diarrhea may occur in the early stages of infection and is common later. The first symptoms of feline distemper become apparent within approximately 10 days of infection. The panleukopenia virus, which causes feline distemper, is highly transmissible and spreads when a cat comes into contact with another infected animal or its secretions, WebMD states. In addition to cats, a variety of susceptible species, including raccoons, serve as reservoirs that support the virus and allow its continued propagation.