COURSE OF INFECTION AND HUMORAL IMMUNE-REACTION IN CALVES INFECTED ORALLY WITH DIFFERENT SALMONELLA SEROVARS

5 groups of five calves each were orally infected with the salmonella serovar S. agona, S. dublin, S. enteritidis, S. infantis or S. typhimurium. The course of infection and the humoral immune response against 5 antigen preparations of the homologous and the 4 heterologous salmonella serovars were monitored in each group. Antibodies against two different protein antigens and against two differently prepared LPS antigens were determined by ELISA and the level of H-agglutinine was assessed by micro agglutination test. All 5 serovars proved to be virulent for calves. The specificity of antibodies produced following the infection are not always consistent with the Kauffmann-White scheme. There was a relation of age and strain for infection on immune response, whereas the severity of infection did no correlate with an increase of antibody production. The serological tests used were good for investigation of a defined host-parasite-interaction but not satisfactory for serovar specific diagnosis of salmonella infection in cattle.