FIELD: medicine.
SUBSTANCE: avirulent Vibrio cholerae strain of biovar eltor of serovar Ogawa - a producer of a major protective O1 antigen of serovar Ogawa is produced in a simulation experiment of virulent natural V.cholerae M569 Ogawa strain by spontaneous loss of "СТХφ" prophage at cholera agent continuance in sterile river water. The strain is deposited in the State Collection of pathogenic bacteria "Microbe" Registration No. 262 of the Collection of Miscroorganisms. A feature of the strain is the absence of genes of a core region of "СТХφ" prophage. The strain is avirulent for suckling rabbits, agglutinated by cholera serums O1 and Ogawa in dilution exceeding a diagnostic titre.
EFFECT: use of the invention allows producing a vaccine of O1 protective antigen of serovar Ogawa providing immunity formation in cholera.
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