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  • Title: Survival of Vibrio vulnificus in shellstock and shucked oysters (Crassostrea gigas and Crassostrea virginica) and effects of isolation medium on recovery.
    Author: Kaysner CA, Tamplin ML, Wekell MM, Stott RF, Colburn KG.
    Journal: Appl Environ Microbiol; 1989 Dec; 55(12):3072-9. PubMed ID: 2619304.
    Abstract:
    When two species of shellstock oysters were artificially contaminated with Vibrio vulnificus, the bacterium survived when the oysters were stored at 10 degrees C and below. Large numbers of endogenous V. vulnificus cells were found after 7 days at both 0.5 and 10 degrees C in uninoculated control oysters (Crassostrea virginica). Oysters allowed to take up V. vulnificus from seawater retained the bacterium for 14 days at 2 degrees C. The presence of V. vulnificus in the drip exuded from the shellstock presented a possibility of contamination of other shellstock in storage. V. vulnificus injected into shucked Pacific (Crassostrea gigas) and Eastern (C. virginica) oysters survived at 4 degrees C for at least 6 days. An 18-h most-probable-number enrichment step in alkaline peptone water gave higher recovery levels of V. vulnificus than did direct plating to selective agars. The survival of this pathogen in both shellstock and shucked oysters suggests a potential for human illness, even though the product is refrigerated.
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