title: Rapid, sensitive, and specific detection of the O4 group of Salmonella enterica by loop-mediated isothermal amplification.
abstract: The present study developed a loop-mediated isothermal amplification (LAMP) assay that amplifies the fragments of O4 Salmonella enterica-specific gene rfbJ and evaluates the potential use in detection of Salmonella enterica serovar Typhimurium (ST). The detection limit of the LAMP assay was 10(3) CFU/ml, which was lower than that of the PCR assay with the same target gene (10(5) CFU/ml), confirmed by electrophoresis. The increased turbidity of the final products of LAMP was also observed with more than 10(3) CFU/ml. Furthermore, the LAMP assay took only 60 min for a reaction, while the PCR assay needed 80-90 min for a reaction and approximately 30 min for the subsequent electrophoresis to confirm the specific band. The positive reaction was only observed for 55 strains of 11 serovars of O4 group Salmonella enterica. The LAMP assay developed in the present study is considered to be an effective method for specific detection of the O4 group Salmonella enterica serovars, including ST.
authors.affiliation: Laboratory of Zoonoses, Kitasato University School of Veterinary Medicine, Towada, Aomori 034-8628, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Okamura
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Ohba
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kikuchi
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Takehara
authors.forename: Masanari
authors.initials: M
authors.lastname: Ikedo
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kojima
authors.forename: Masayuki
authors.initials: M
authors.lastname: Nakamura
mesh_terms: D001431:Bacteriological Techniques; D001483:Base Sequence; D004269:DNA, Bacterial; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D016133:Polymerase Chain Reaction; D019779:Salmonella enterica / Q000145:classification* / Q000302:isolation & purification*; D012680:Sensitivity and Specificity; D013997:Time Factors
chemical_list: D004269:DNA, Bacterial