Abstract
To quantify the number of Vibrio vulnificus in shellfish, we compared the most probable number (MPN) combined with a culture (MPN-culture) or polymerase-chain reaction (PCR) assay (MPN-PCR) to a quantitative PCR assay. Enrichment in alkaline peptone water by MPN was conducted at 25 and 35 degrees C. Enrichment at 35 degrees C was superior or similar to enrichment at 25 degrees C in over 65% of samples by MPNculture and in more than 75% of samples by MPN-PCR assay. V. vulnificus was more easily isolated on chromogenic agar medium during culture, MPN-PCR assay was superior or similar to MPNculture in over 90% of samples by enrichment at 25 degrees C and to over 88% of samples by enrichment at 35 degrees C. The number of V. vulnificus by quantitative PCR assay was similar to that of MPN-PCR assay in 6 of 8 samples but not from MPNculture. V. vulnificus contamination was frequently detected in samples from Kyushu Island.
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