FIV/FeLV testing in house- The AAFP (American Association of Feline Practitioners) recommend testing at-risk cats, sick cats, and kittens to determine their infection status. FIV is the feline immunodeficiency virus and FeLV is the feline leukemia virus. Both are found nationwide and are highly contagious. It is transmitted cat to cat. FIV and FeLV are the leading causes of illness and death in cats. Early detection will help you manage the disease, maintain the health of your cat, and prevent the spread of infection to other cats.