Progress on Subgroup J Avian Leukosis Virus for the past few Years

Avian Leukosis Virus Subgroup J(ALV-J) is a new kind of subgroup that was firstly reported and isolated from meat-type chickens in beginning of the 90s of 20th century,which predominantly induced avian myelocytic myeloid(ML) in broilers.Subgroup J Avian Leukosis showed a high trend of outbreak in China in 2009.It was in 1999 that ALV-J was firstly isolated and identified from two broiler flocks in China,and then the research was developed successively.This paper outlines the research progress on ALV-J in the field of epidemiology,detection method,variation,immunosuppression and coinfection.