In this study, the previously established PCR-single-strand conformation polymorphism (SSCP) system for detecting and identifying gram-negative histamine-producing bacteria was evaluated. This system can detect and identify histamine-producing bacteria directly from seafood by the use of sequence polymorphisms of the histidine decarboxylase gene (hdc). First, we isolated 81 histamine-producing strains of bacteria from fish samples and analyzed the hdc gene by the PCR-SSCP system. The 22 newly obtained SSCP banding patterns were added to our database, and the utility of our modified database was tested in a second experiment consisting of 18 strains of histamine-producing bacteria isolated from 25 fish samples. Approximately 80% of the histamine-producing strains corresponded to those in the new database. Use of the database for PCR-SSCP analysis, including the band patterns newly added in this study, for the hdc gene makes it possible to more accurately identify histamine producers.
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