[Elimination of Klebsiella pneumoniae and humoral immunity in immunization with the IS-4 immunostimulating mixture].

The present investigation has revealed that in mice, immunized with preparation HC-4 (an immunostimulating agent consisting of water-soluble antigenic complexes obtained from 4 opportunistic microorganisms: Klebsiella pneumoniae, staphylococcus, Proteus and Escherichia coli K-100 having a common antigen with Haemophilus influenzae) and challenged with K. pneumoniae culture on day 7 after immunization, the complete elimination of K. pneumoniae from the blood occurs within 24 hours. The subcutaneous immunization of rabbits with the above preparation leads to a significant increase in antibody titers, determined in the passive hemagglutination test with Klebsiella diagnosticum. The test of the passive protection of mice from Klebsiella sepsis has revealed a rise in the preventive activity of the sera of rabbits immunized with this preparation.