Distribution of ST (present in ≥5 isolates) and O-serotypes (present in ≥7 isolates). STs and O-serotypes present in, respectively, five or fewer and seven or fewer isolates are summarized as ‘other’. (a) The proportion of STs across hospital sites. (b) The pairwise correlation of STs with Clermont phylogroups. The magnitude of the circles indicates the number of isolates following the legend. (c) The proportion of O-serotypes across hospital sites. D The pairwise correlation of O-serotypes and ST. The magnitude of the circles indicates the number of isolates following the legend.