Graduate Thesis Or Dissertation
 

Comparative phenotypic studies on vibrios of environmental origin that resemble human clinical isolates

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cn69m7819

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  • A comparative investigation of the phenotypic properties of environmental and clinical strains of the lactose-positive human pathogen, Vibrio vulnificus, revealed that they are indistinguishable in traits commonly used for identification in clinical and public health laboratories. It has also been confirmed that there are other strains of undefined Vibrio spp., readily isolated from estuarine environments, which are capable of lactose fermentation. Relatively extensive phenotypic analysis may be necessary to differentiate these strains from V. vulnificus. Strains of a Vibrio sp., pathogenic to eels commercially cultured in Japan, have been shown by DNA base composition and DNA homology to be members of the species V. vulnificus. Differences in phenotype and host specificity however, indicate that the eel isolates represent a different biogroup of V. vulnificus. It is proposed that strains similar in phenotype to the type strain of the species be classified as V. vulnificus biogroup 1, and that the eel isolates be classified as V. vulnificus biogroup 2. A group of organisms, phenotypically similar to the human pathogen Vibrio fluvialis, have been isolated from oysters suspected as the source of several cases of gastroenteritis in Louisiana, and from water, sediment, and shellfish in the Pacific Northwest. DNA base composition and DNA homology analyses have shown these organisms to actually be strains of the fish pathogen V. anguillarum. These V. anguillarum are atypical in some of their phenotypic properties and in their sources of isolation. It is suggested that V. anguillarum is not only a parasite of fish, but is free-living in coastal waters and may represent a potential health hazard when present in large numbers in contaminated shell fish.
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