Most species within the Salmonella and Shigella genera do not have the check details ability to ferment lactose. However, Shigella sonnei may ferment lactose, but only after extended incubation [31]. ChromID ESBL, Brilliance ESBL and BLSE agar are available as “ready to use” plates from the producers, while CHROMagar ESBL is sold as a powder base. Statistical analyses The calculation of the sensitivity for detecting ESBL-carrying isolates for each screening agar was based on a total of 87 isolates, Palbociclib 51 isolates carrying ESBLA genotypes and 36 carrying AmpC genotypes. The single isolate which was

both ESBLA – and AmpC positive was counted as an AmpC in the statistical analysis. For each agar plate the total sensitivity was calculated (ESBLA + AmpC) (n = 87), as well as the sensitivity for ESBLA and AmpC alone (n = 51 and n = 36, respectively). A 95% confidence interval (95% CI) for each value was manually calculated using binomial proportions’ confidence interval. Results The ESBL genotyping results are shown in Tables 2 and 3. The genotypic characterisation enabled prediction of growth and color JQ-EZ-05 mouse of the colonies growing on the various media. The expected outcome was compared with the observed results. The expected colony colours for Salmonella spp. and Shigella sonnei on each ESBL screening agar are shown in Figure 1. The grading of growth for the 87 isolates is presented in Tables 4 and 5, respectively. The calculated sensitivity is presented

in Table 6. Table 2 Distribution of ESBL-genes in the 87 isolates   ESBL A ESBL A + AmpC AmpC Total   CTX-M SHV-12 CTX-M −15 + SHV-12 TEM-63 + CMY-2 CMY-2 DHA-1   Salmonella 26 3 4 1 33 1 68 Shigella 18 0 0 0 1 0 19 Total 44 3 4 1 34 1 87 Table 3 Genotypes within the CTX-M-isolates   Salmonella Shigella CTX-M-1 1 0 CTX-M-3 ADP ribosylation factor 0 1 CTX-M 3/22 1 0 CTX-M-9 1 0 CTX-M 14/17/18 7 1 CTX-M 15 16 15 CTX-M-27 0 1   26 18 Figure 1 Picture of normal

growth of Salmonella (left) and Shigella sonnei (right) with ESBL genotypes. All ESBL positive isolates were mixed with a fecal suspension controlled for the absence of Salmonella, Shigella and any other ESBL-producing bacteria, before being inoculated onto the screening agars. The Lactose and XLD agars (top) were used as controls. a = Salmonella, b = Shigella sonnei, 1 = Lactose + XLD (control agars), 2 = BLSE agar, 3 = Brilliance ESBL, 4 = ChromID ESBL, 5 = CHROMagar ESBL. Table 4 Grading of growth of 68 ESBL A – and/or AmpC-producing Salmonella isolates (n=68) Growth Excellent Good Poor No growth   ESBL A AmpC ESBL A AmpC ESBL A AmpC ESBL A AmpC Brilliance ESBL 31 9 1 5 1 17   4 BLSE agar* – Drigalski 31 35 1       1   BLSE agar* – Mac Conkey 31 34   1 1   1   CHROMagar ESBL 32 4 1 4   14   13 ChromID ESBL 33 12   16   4   3 All ESBL-producing isolates were mixed with a fecal suspension controlled for the absence of Salmonella, Shigella and any other ESBL-producing bacteria, before being inoculated on the screening agars.