EN
Six various motile Areromonas strains were evaluated with regard to their induction of agglutinin and precipitin production in the serum of immunised rabbits. The results were compared with immunogenic activities of the strains against MAS in carp. A total of 74 Aeromonas sp. strains were involved in carrying out agglutination and precipitation tests. No relationship between agglutinin production and the immunogenic properties of the strains used was determined. In contrast, strains inducing precipitin production against a wide antigen spectrum of non-homologous Aeromonas sp. strains demonstrated the highest immunogenic activity in carp. The immunity of carp derived from vaccinations with the antigens of certain motile Aeromonas strains effectively protected against both homologous and non-homologous strains from this group of microorganisms.