Fig. 2

The Simpson’s index of diversity (D) for each sample category. Sample categories are ranked in order of most diverse to least diverse, with higher values of D reflecting a greater diversity of serotypes within that sample category. The most frequently isolated serotype from each sample category and percentage of isolates within the sample category comprising the top serotype are also given. Monophasic-other refers to serotypes, other than S. Typhimurium, that are missing an H antigen and are therefore not able to be typed as a particular serotype. *Refers to non-animal sourced foods. ^ Subsp II ser 1,4,12,27:b:[e,n,x] (Sofia)