[Multiplication dynamics in a pulmonary model of Sh. sonnei and Sh. flexneri differing in virulence].

The most essential differences in the time course proliferation of virulent and a virulent Sh. sonnei and Sh. flexneri strains in the pulmonary model were found to become, manifest 3--6--9 hours postinoculation. In contrast to the avirulent Sh. flexneri strains smooth type, with its intensive elimination, the avirulent Sh. sonnei strains in phase I were preserved on their primary infective level during these hours, and their subsequent elimination was slower. The differences thus revealed seem to confirm the opinion that Sh. sonnei (phase I) antigen is a type C (capsular) antigen having pronounced antiphagocytic activity.