Table 1. Distribution of disease severity across 10 different sequence types of 100 STEC O91 strains isolated from humans*.
| ST (Serotype) | Most severe symptom of patients infected with STEC O91 |
Total no. strains | |||
|---|---|---|---|---|---|
| HUS (n = 4) | BD (n = 8) | D (n = 79) | A (n = 9) | ||
| ST33 (O91:H14/H–/Hnt) | 0 | 5 | 51 | 7 | 63 |
| ST442 (O91:H21) | 4 | 3 | 12 | 1† | 20 |
| ST641 (O91:H10) | 0 | 0 | 2 | 0 | 2 |
| ST690 (O91:H14) | 0 | 0 | 8 | 1 | 9 |
| ST1020 (O91:H8) | 0 | 0 | 1 | 0 | 1 |
| ST1048 (O91:H14) | 0 | 0 | 1 | 0 | 1 |
| ST1051 (O91:H14) | 0 | 0 | 1 | 0 | 1 |
| ST1052 (O91:H14) | 0 | 0 | 1 | 0 | 1 |
| ST1053 (O91:H14) | 0 | 0 | 1 | 0 | 1 |
| ST1054 (O91:Hnt) | 0 | 0 | 1 | 0 | 1 |
*ST, sequence type; STEC, Shiga toxin–producing Escherichia coli; H, H-antigen nonmotile strains; Hnt, H-antigen nontypeable strains; HUS, hemolytic uremic syndrome; BD, bloody diarrhea; D, diarrhea without visible blood; A, asymptomatic infection (1 patient infected with ST442 [STEC O91:H21] had abdominal cramps without diarrhea). †Abdominal cramps without diarrhea.