Definition: A genus of the family RETROVIRIDAE with type C morphology, that causes malignant and other diseases in wild birds and domestic fowl.
infection: coordinate IM with AVIAN LEUKOSIS (IM) or SARCOMA, AVIAN (IM), but if not so specified coord IM with RETROVIRIDAE INFECTIONS (IM) + TUMOR VIRUS INFECTIONS (IM) if pertinent; index also BIRDS or POULTRY (NIM) or specific bird or fowl (IM)
ExamplesAvian leukosis virus; Avian myeloblastosis virus; Avian Sarcoma Viruses