Feline leukemia virus
（重定向自FELV）
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Feline leukemia virus (FeLV) is a retrovirus that infects cats. FeLV can be transmitted from infected cats when the transfer of saliva or nasal secretions is involved. If not defeated by the animal’s immune system, the virus can cause diseases which can be lethal. One disease caused by this virus is a form of cancer of the blood cells called Lymphoma (a leukemia).