The feline leukemia virus question.
D000818:Animals; D002371:Cat Diseases / Q000209:etiology; D002415:Cats; D004285:Dogs; D005260:Female; D006801:Humans; D007938:Leukemia / Q000209:etiology / Q000662:veterinary; D005256:Leukemia Virus, Feline; D008297:Male