Feline leukemia is a viral disease that affects cats. The virus responsible for this disease is known as the feline leukemia virus. Feline leukemia is also referred to as feline lymphosarcoma or feline AIDS, although the latter term is now less commonly used. Other synonyms for feline leukemia include feline oncovirus, feline retrovirus, and feline immunodeficiency virus. It is important to note that feline immunodeficiency virus is a separate virus that also affects cats but is not the same as feline leukemia virus. Regardless of the terminology used, feline leukemia is a serious condition that can lead to a weakened immune system, anemia, and cancer. Regular veterinary checkups and vaccinations can help prevent this disease.