1. Rabies (this can be spread to people)
  2. Feline panleukopenia (feline distemper)
  3. Feline herpesvirus infection
  4. Feline calicivirus infection
  5. Feline leukemia (FeLV)
  6. Feline immunodeficiency virus (FIV) infection
  7. Heartworm disease
  8. Intestinal worms (roundworms, hookworms, whipworms, tapeworms, etc., some of which can also infect people)