2 Cooked dishes (16), Pork (28), Diary products (14), Beef (6), Seafood (5), Egg products (5), Vegetables (3), Unknown (13). A set of control strains was used to validate the STM GeneDisc® array (Table 3). Reference strain LT2 was used as a positive control for testing SPI genetic markers (ssaQ, mgtC, spi4-D and sopB genes), and virulence plasmid pSLT (spvC gene). Typhimurium strain Caspase inhibitor 08CEB5766SAL was used as a negative control for testing the ssaQ, sopB and spvC markers, whereas the

00-01041 strain kindly provided by the Federal Institute for Risk Assessment (BfR) in Berlin, Germany, was used as a negative template to test www.selleckchem.com/products/chir-99021-ct99021-hcl.html the spi4_D and mgtC markers. All these negative control strains had been tested previously using conventional PCR. Table 3 Set of control strains Strain Source DT104 16S- 23S

spacer ssaQ mgtC spi4_D sopB spvC SGI1 left Junction intI1 bla TEM sul1 LT2   – + + + + + – - – - 05CEB1571SAL ANSES + + + + + + + + – - 07CEB5289SAL ANSES – + + + + – - + + + 07CEB9150SAL ANSES + + + + + – - – + – 01CEB12158 ANSES – + + + + – - – - – 08CEB5766SAL ANSES + – + + – - – - – - 63.48 DTU Food + + + + + – - – + – 61.12 DTU Food – + + + + – - + + + 00-01041 BfR     – -             The specificity of the phage selleckchem type DT104 marker targeting the 16S-23S rRNA intergenic spacer region was tested with 43 strains of different phage types: atypical DT146 (n = 1), DT120 (n = 10), DT135 (n = 1), DT99 (n = 1), DT8 CYTH4 (n = 2), DT193 (n = 4), DT30 (n = 2), DT12 (n = 2), DT4 variant (n = 1), U302 (n = 12), DT2 (n = 1), DT208 (n = 1), DT12a (n = 1), DT136 (n = 1), DT18 (n = 1), DT36 (n = 1), U311 (n = 1) and 59 strains of phage type DT104. Phage-typing had already

been performed either in the Laboratory of Gastrointestinal Pathogens at the Health Protection Agency (HPA, London, UK) or in the National Reference Centre on Salmonella at the Institut Pasteur (Paris, France). The presence of SGI1 was explored by targeting the left junction sequence and detecting integrase of class 1 integron gene (intI1) and a sulfonamide resistance determinant (sul1). The positive control strain used for these three markers was S. Typhimurium strain 05CEB1571SAL, a strain isolated from turkey and well-characterized by a European project. Positive results had already been detected for the left junction sequence, intI1 and sul1 genes.