Avian Leukosis Virus Type J (ALV-J) in the Czech Republic

The paper describes the first occurrence of myelocytomatosis in the Czech Republic. A group of hens from the breeding flocks of the meat type aged 27 and 50 weeks with increased mortality and tumorous disease occurrence was examined. Necropsy and pathohistology proved myelocytomatosis. The presence of the ALV subtype J virus was proved using PCR.