Avian leukosis virus Subgroup J (ALV-J) is a retrovirus that infects meat-type chickens. ALV-J was first reported as a new subgroup of ALV by Payne in 1991. It induced avian myelcytomatosis (ML) in broiler.

• J亚群禽白血病病毒(Subgroup J of Avian leukosis viruS，ALV-J)是90年代初由英国鉴定出来的禽白血病病毒(ALV)新的亚群，主要引起肉鸡的骨髓瘤白血病。