EN
Polish ELISA set, prepared in the Veterinary Research Institute, has been compared with sets produced in the German Federal Republic, Czechoslovakia, France and Belgium. Comparative examinations were performed in a herd comprising 44 cows which revealed a high percentage of positive reagents in the AGID test. In general, the results obtained by means of different tests, recommending high dilution of sera, showed several negative results in samples which appeared to be positive by using other sets. The investigations showed that the Polish ELISA set for the diagnosis of bovine leukosis is not inferior to the commercial sets, offered by the renowned biological producers.