EN
Eight commercial BLV antigens for serological diagnosis of the disease were compared. They were produced in the U.S.A., Federal Republic of Germany, Bulgaria, Romania, Czechoslovakia, Poland, German Democratic Republic and the Soviet Union. Homogenity of these preparations was investigated by means of polyacrylamide gel electrophoresis. The contaminations with bovine serum proteins were estimated by immunoelectrophoresis. The serologic activity of them was established with SRID, using the same sera (BLV positive and negative). It has been demonstrated that all the preparations proved to be suitable for the practical use and they yielded comparable results.