It is recommended that all kittens are tested for Feline Leukemia (FeLV) and Feline Immunodeficiency Virus (FIV). FeLV and FIV infections are a major cause of death in cats. Surveys show that up to 15% of sick cats are infected with one or both of the viruses. Even cats that appear to be healthy may harbor infection and spread the viruses to other cats. In some cats, signs of disease may not become obvious until weeks or even years after they are first infected with FeLV and FIV. There is no cure for either of these diseases. Cats contract FelV and FIV from other cats: FELV via direct contact and FIV via bites. Kittens born from infected mothers may be infected as well. Diagnosing FeLV and FIV is simple. A small blood sample is taken from your kitten and sent to the lab.