[On the serology and immunbiology of listeriosis. VII. Communication: Further investigations on the agglutination-immobilization test (author's transl)].

Factor antisera oriented to different serovars of Listeria moncytogenes, expecially to serovar 7 and Murray grayi (Listeria grayi) were tested. It was found that the agglutination-immobilization test detects antibodies oriented to the H-antigen. By contrast, the growth inhibition test measures antibodies oriented to the O-antigen. Summarizingly, it can be stated that the following three seroreactions, each based on a different mode of action, are available for the determination of antibodies specifically oriented to the somatic or flagellar antigens of L. monocytogenes: 1. Bacterial agglutination reaction for the detection of O and H antibodies 2. The growth-inhibition test for the detection of O antibodies 3. The agglutination-immobilization test for the detection of H antibodies.