title: Multiplex polymerase chain reaction to detect toxigenic Vibrio cholerae and to biotype Vibrio cholerae O1.
abstract: A multiplex polymerase chain reaction (PCR) was developed to identify cholera toxin-producing Vibrio cholerae and to biotype V. cholerae O1. Enterotoxin-producing V. cholerae strains were identified with a primer pair that amplified a fragment of the ctxA2-B gene. Vibrio cholerae O1 strains were simultaneously differentiated into biotypes with three primers specified for the hylA gene in the same reaction. The hlyA amplicon in the multiplex PCR serves as an internal control when testing toxin-producing strains, as hlyA gene sequences exist in all tested V. cholerae strains. Enrichment of V. cholerae present on oysters for 6 h in alkaline peptone water before detection by a nested PCR with internal primers for ctxA2-B gene yielded a detection limit lower than 3 colony-forming units (cfu) per gram of food.
authors.affiliation: Division of Epidemiology, National Defense Medical Center, Sanhsia, Taipei, Taiwan, ROC.
authors.forename: Y H
authors.initials: YH
authors.lastname: Shangkuan
authors.forename: Y S
authors.initials: YS
authors.lastname: Show
authors.forename: T M
authors.initials: TM
authors.lastname: Wang
mesh_terms: D000818:Animals; D015373:Bacterial Typing Techniques; D001483:Base Sequence; D002772:Cholera Toxin / Q000235:genetics; D017931:DNA Primers; D004269:DNA, Bacterial / Q000032:analysis; D004587:Electrophoresis, Agar Gel; D004768:Enterotoxins / Q000235:genetics; D005516:Food Microbiology; D008969:Molecular Sequence Data; D010125:Ostreidae / Q000382:microbiology; D016133:Polymerase Chain Reaction; D012680:Sensitivity and Specificity; D014734:Vibrio cholerae / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial; D004768:Enterotoxins; D002772:Cholera Toxin