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Relationship between total number of V. parahaemolyticus organisms and number of tdh-positive V. parahaemolyticus organisms in seafood. Each circle indicates the number in each sample. ND, tdh gene not detected by qualitative analysis (<1 CFU/25 g), NC, tdh gene not detected by quantitative analysis (<3 MPN/10 g) but detected by qualitative analysis (>1 CFU/25 g).
