FIELD: biotechnology, microbiology. SUBSTANCE: invention proposes the novel strain of bacterium Leuconostoc mesenteroides N 05-19S producing antigenic protein- -containing complex. Strain is deposited in collection NII of vaccines and sera of RAMS. Strain can be used as a producer of antigenic complex or on some media as a producer of dextran that is the base in production of blood substituents. Indicated antigenic complex can be used for preparing: (1) diagnosticum that in turn can be used for assay of antibodies in human serum blood to protein-containing antigenic complex of Leuconostoc mesenteroides; (2) rabbit anti-Leuconostoc mesenteroides - sera that are necessary in reversed radial immunodiffusion method for impurities of Leuconostoc mesenteroides in dextrane preparations. EFFECT: higher efficiency of new strain. 3 tbl, 2 ex
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