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Occurrence of Toxigenic Vibrio cholerae O1 in Oysters in Mobile Bay, Alabama: An Ecological Investigation

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Toxigenic Vibrio cholerae O1 Inaba, resembling the epidemic Latin American strains (C6706, C6707), was recovered from oysters taken from Mobile Bay, Alabama, on five separate occasions between July 1991 and September 1992. Levels of toxigenic V. cholerae in the oysters, estimated by the most probable number procedure, ranged from 101 to 107 per 100 g. Isolates characterized by pulsed field gel electrophoresis resembled isolates previously recovered from five cargo ships docked at Gulf of Mexico ports. This study details the first reported isolation of toxigenic V. cholerae O1 from oysters in U.S. coastal waters. As with the Gulf Coast strain, the occurrence of the epidemic strain seems to be sporadic and essentially limited to the warmer months.


Document Type: Research Article

Affiliations: Gulf Coast Seafood Laboratory, U.S. Food and Drug Administration, Dauphin island, Alabama 36528

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