1887

Abstract

Four Vibrio spp. isolates from the historical culture collection at the Centers for Disease Control and Prevention, obtained from human blood specimens (n=3) and river water (n=1), show characteristics distinct from those of isolates of the most closely related species, Vibrio navarrensis and Vibrio vulnificus , based on phenotypic and genotypic tests. They are specifically adapted to survival in both freshwater and seawater, being able to grow in rich media without added salts as well as salinities above that of seawater. Phenotypically, these isolates resemble V. navarrensis , their closest known relative with a validly published name, but the group of isolates is distinguished from V. navarrensis by the ability to utilize l-rhamnose. Average nucleotide identity and percent DNA–DNA hybridization values obtained from the pairwise comparisons of whole-genome sequences of these isolates to V. navarrensis range from 95.4–95.8 % and 61.9–64.3 %, respectively, suggesting that the group represents a different species. Phylogenetic analysis of the core genome, including four protein-coding housekeeping genes (pyrH, recA, rpoA and rpoB), places these four isolates into their own monophyletic clade, distinct from V. navarrensis and V. vulnificus . Based on these differences, we propose these isolates represent a novel species of the genus Vibrio , for which the name Vibrio cidicii sp. nov. is proposed; strain LMG 29267 (=CIP 111013=2756-81), isolated from river water, is the type strain.

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2016-10-01
2019-10-15
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