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. 1996 Mar;62(3):918–927. doi: 10.1128/aem.62.3.918-927.1996

Phenotypic characterization of Vibrio vulnificus biotype 2, a lipopolysaccharide-based homogeneous O serogroup within Vibrio vulnificus.

E G Biosca 1, J D Oliver 1, C Amaro 1
PMCID: PMC167856  PMID: 8975619

Abstract

In this study, we have reevaluated the taxonomic position of biotype 2 of Vibrio vulnificus. For this purpose, we have biochemically and serologically characterized 83 biotype 2 strains from diseased eels, comparing them with 17 biotype 1 strains from different sources. Selected strains were also molecularly analyzed and tested for eel and mouse pathogenicity. Results have shown that biotype 2 (i) is biochemically homogeneous, indole production being the main trait that distinguishes it from biotype 1, (ii) presents small variations in DNA restriction profiles and outer membrane protein patterns, some proteins being immunologically related to outer membrane proteins from biotype 1, (iii) expresses a common lipopolysaccharide (LPS) profile, which is immunologically identical among strains and distinct from that of LPS of tested biotype 1 strains, and (iv) contains at least two high-Mr plasmids. Regarding host range, we have confirmed that both biotypes are pathogenic for mice but only biotype 2 is pathogenic for eels. On the basis of these data, we propose that biotype 2 of V. vulnificus constitutes an LPS-based O serogroup which is phenotypically homogeneous and pathogenic for eels. In this article, the serogroup is designated serogroup E (for eels).

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Selected References

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