Анотация: An outbreak of chicken infectious anemia virus-related clinical signs in broiler flocks is described. The flocks were derived from three broiler breeder flocks. The presence of CIAV sequences was determined by PCR in the progeny, broiler flocks, and CIAV-antibody levels in the parent broiler breeder flocks were determined by ELISA. These levels were low and inconsistent,. The progeny broiler flocks showed typical clinical signs of CIAV-infection and were PCR positive. The survey also included three control unaffected broiler flocks, that originated from breeder flocks of similar ages and genetic lines, and reared on other breeding farms. These differed in the maternal antibody levels transmitted to their progeny. Moreover the progeny flocks were negative clinically and by CIAV-PCR