The data on the study of antilysozyme and anti-interferon properties of 375 Klebsiella strains are presented. The heterogeneity of strains with respect to their antilysozyme and anti-interferon activity is described. As revealed in this study, these properties occur more frequently and considerably to a greater extent in strains isolated from patients with Klebsiella infections and from carriers. Strains, incapable of inhibiting lysozyme and interferon or capable to digest them poorly, prevail among strains isolated from healthy persons. The data on the relationship between the level of the persistence factors of Klebsiella and the source of their isolation are presented.
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