STX1A and hemolytic-uremic syndrome: Six of 18 serotypes outlined in Table 1 (O103:H2, O5:HNT, O103:H25, O153:H2, O84:H2, O182:H25) had virulence profiles that included eae, in association with stx1a. None of these six serotypes were common amongst cases of severe illness and/or HUS (Figure 6).