Toxic and enzymatic activities of Vibrio vulnificus biotype 2 with respect to host specificity

Article Abstract:

The extracellular products (ECPs) of Vibrio vulnificus biotype 2 contribute to bacterial virulence for eels and other warm-water and cold-water fish. The ECPs of biotypes 1 and 2 show significant proteolytic, phospholipasic and hemolytic activities. There is a loss of the enzymatic activities after heat treatment, indicating that the heat-labile molecules are proteins. The hydrolytic and cytotoxic capabilities and lethality of the type 1 and 2 ECPs for eels are similar but biotype 1 is avirulent for eels.

Diseases, Virulence (Microbiology), Eels

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Siderophore-mediated iron acquisition mechanisms in Vibrio vulnificus biotype 2

Article Abstract:

A study was conducted on the ability of Vibrio vulnificus biotype 2 to acquire iron through various mechanisms. Siderophore-mediated mechanisms and the role of free iron in vibriosis were analyzed. The role of capsule in iron acquisition was also examined by using capsulated and acapsulated original isolates. Results showed that the biotype 2 expresses an iron uptake mechanism dependent on siderophores. The chelator triggering iron acquisition from transferrins was postulated to be the hydroxamic type.

Physiological aspects, Chelating agents, Bacteria, Iron, Iron (Metal)

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Vibrio vulnificus biotype 2, pathogenic for eels, is also an opportunistic pathogen for humans

Article Abstract:

The Vibrio vulnificus biotype 2 is an opportunist pathogen for humans under favourable circumstances. The strain ATCC 33817 initially isolated from a human leg wound has been identified as V. vulnificus biotype 2. The strain gives negative results in the indole test and is pathogenic for eels and mice. It belongs to the serogroup E and has two plasmids. V. vulnificus has phenotypically different strains some of which are pathogenic for humans but only the serogroup E infects eels.

Identification and classification, Pathogenic microorganisms

Similar abstracts:

• Abstracts: Effects of salinity and temperature on long-term survival of the eel pathogen Vibrio vulnificus biotype 2 (serovar E)
• Abstracts: Phenotypic and genotypic characterization of Vibrio vulnificus: proposal for the substitution of the subspecific taxon biotype for serovar

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