[Evaluation of the postvaccination level of influenza antibodies by means of the radial immunodiffusion and hemagglutination inhibition reactions].

Comparative data on the antibody levels obtained by the radial immunodiffusion and hemagglutination inhibition tests were studied. The possibility of using the radial immunodiffusion test for evaluation of the level of influenza antibody in human sera was confirmed. Because this method has comparatively low sensitivity (positive results were obtained only with sera having angihemagglutinin titers of 1:80 or higher), it may have only a limited use in studies of immunogenic activity of live influenza vaccines.