The article deals with results of studying parahemolytic vibrio separatedfrom different sources according their phenotype and genotype attributes associated with virulence. In certain cases the mismatch of results of Kanagava tests and polymerase chain reaction test of gene tdh was established. The need in virulence complex evaluation is substantiated. This complex has to include detection of hemolytic activity in Kanagava test and urease activity on the Kristensen medium and polymerase chain reaction detection of genes tdh and trh. The developed complex technique is described. The formula of pathogenic strains is established Three alternatives of virulent parahemolytic vibrio are given. The test-strains Vibrio parahaemolyticus are proposed as control in testing phenotype and genotype strains according virulence signs.

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