In the present work by the method of molecular DNA hybridization there was shown a low degree of affinity of the standard museum strains of cholera vibrios to the respresentatives of the sea species V. parahaemolyticus and V. alginolyticus, and also halophilic vibrios identified earlier on the basis of phenotypical characteristics of the nucleotide DNA composition as Marinovibrio. The presence of only 20--30% of homology in the DNA successiveness in cholera vibrios and the mentioned sea bacteria pointed to the necessity of exclusion of the latter from the Vibrio genus.
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