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Vibrio parahaemolyticus food poisoning, is the most prevalent among bacterial food poisoning in Japan. Study of epidemiologic markers is important in an attempt to trace the source of contamination. The purpose of this study was to compare seven different typing methods (serotyping, plasmid profile, antibiogram, phage susceptibility. TDH production, tdh and trh gene and pulsed-field gel electrophoresis [PFGE]) for V. parahaemolyticus. Outbreaks of V. parahaemolyticus food poisoning which occurred during the 13 years from 1981 to 1993 numbered 43 including 481 cases in Nagano Prefecture. Serovar O4:K8 was the most prlevalent serovar isolated, serovar O2:K3, O4:K63 and O3:K5 followed. Forty one strains of V. parahaemolyticus were used in this study. All of the strains were isolated from 12 food poisoning cases at Nagano Prefectual Research Institute for Health and Pollution. Of the 41 strains, twenty two strains (O4:K8, O4:K63) were sensitive to both phi VP 253 and phi VP 143 phages, six strains (O3:K5) to phage phi VP 143. Thirteen strains (O3:K29, O4:K11, O4:K12 and O5:KUT) were insensitive to both phages. CBPC, CBPC.CEZ and CBPC.CEZ.KM.SM resistant strains was determined in 22 strains out of 41 strains. Five strains of V. parahaemolyticus carried plasmid. Of the 41 strains, thirty nine strains were possessive to tdh gene and productive to TDH. Chromosomal DNA of the isolates from 12 different outbreaks was analysed by PFGE after Not I digestion. PFGE analysis of the digested DNA yielded 11 to 21 DNA fragments. Twelve distinctive fragment patterns were identified in 41 V. parahaemolyticus isolates from 12 different food poisonings. These results showed that the PFGE method is an useful tool to analyse an epidemiological survey for isolates of Vibrio parahaemolyticus food poisoning.

Comparison of Epidemiological Markers for Vibrio parahaemolyticus Isolated from Food Poisoning