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Appl. Environ. Microbiol., 10 1995, 3656-3660, Vol 61, No. 10
Copyright © 1995, American Society for Microbiology

Uptake and retention of Vibrio cholerae O1 in the Eastern oyster, Crassostrea virginica

RL Murphree and ML Tamplin
Department of Biology, Jacksonville State University, Alabama 36265, USA.

Vibrio cholerae 01, the causative agent of cholera, is known to persist in estuarine environments as endogenous microflora. The recent introduction of V. cholerae 01 into estuaries of the North and South American continents has stimulated the need to determine the effect of controlled purification on reducing this pathogen in edible molluscan shellfish. Experiments defined parameters for the uptake and retention of V. cholerae 01 in tissues of Crassostrea virginica, and these parameters were compared with those for Escherichia coli and Salmonella tallahassee, bacteria which are usually eliminated from moderately contaminated shellfish within 48 h. Oysters accumulated greater concentrations of V. cholerae 01 than E. coli and S. tallahassee. When V. cholerae 01 was exposed to controlled purification at 15, 19 and 25 degrees C over 48 h, it persisted in oysters at markedly higher levels than E. coli and S. tallahassee. The concentration of a V. cholerae 01- specific agglutinin did not positively correlate with the uptake or retention of V. cholerae 01. These data show that state and federally approved controlled purification techniques are not effective at reducing V. cholerae 01 in oysters.


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