The inter- and intrageneric relationships of the genus Vibrio were investigated by performing a comparative analysis of the 16S rRNAs of 10 species, including four pathogenic representatives. The results of immunological and 5S rRNA studies were confirmed in that the genus is a neighboring taxon of the family Enterobacteriaceae. With regard to the intrageneric structure, Vibrio alginolyticus, Vibrio campbellii, Vibrio natriegens, Vibrio harveyi, Vibrio proteolyticus, Vibrio parahaemolyticus, and Vibrio vulnificus form the core of the genus, while Vibrio (Listonella) anguillarum, Vibrio diazotrophicus, and Vibrio hollisae are placed on the outskirts of the genus. Variable regions around positions 80, 180, and 450 could be used as target sites for genus- and species-specific oligonucleotide probes and polymerase chain reaction primers to be used in molecular identification.
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