%0 Journal Article %A Chapman, P. A. %A Siddons, Christine A. %A Zadik, P. M. %A Jewes, Linda %T An improved selective medium for the isolation of Escherichia coli O 157 %D 1991 %J Journal of Medical Microbiology, %V 35 %N 2 %P 107-110 %@ 1473-5644 %R https://doi.org/10.1099/00222615-35-2-107 %I Microbiology Society, %X Summary. Sorbitol-MacConkey medium has become widely used for the isolation of verotoxigenic (VT+) Escherichia coli O157. However, many organisms other than VT+ E. coli O157, especially other serogroups of E. coli and Proteus spp., may not ferment sorbitol, and thus may be confused initially with VT+ E. coli O157. Rhamnose is not fermented by VT+ E. coli O157, but is by most sorbitol non-fermenting E. coli of other serogroups. Cefixime is a cephalosporin antibiotic that is more active against Proteus spp. than against E. coli. Inclusion of rhamnose and cefixime in sorbitol-MacConkey agar improves its selectivity for the isolation of VT+ E. coli O157. %U https://www.microbiologyresearch.org/content/journal/jmm/10.1099/00222615-35-2-107