Table 1. Results of O-serogrouping and virulence factor-profiling.
| O serogroup |
Virulence factor profile |
||||
|---|---|---|---|---|---|
| O serogroup | No. of isolates (%) | Toxin | No. of isolates (%) | Fimbriae | No. of isolates (%) |
| O139 | 76 (21.1) | Stx2e | 76 (100) | F18 | 74 (97.4) |
| STa | 6 (7.9) | ||||
| STb | 8 (10.5) | ||||
| OSB9 | 69 (19.2) | Stx2e | 69 (100) | F18 | 69 (100) |
| LT | 69 (100) | ||||
| STa | 69 (100) | ||||
| STb | 58 (84.1) | ||||
| EAST1 | 33 (47.8) | ||||
| O149 | 44 (12.2) | LT | 41 (93.2) | F4 | 39 (88.6) |
| STa | 33 (75.0) | F18 | 1 (2.3) | ||
| STb | 40 (90.9) | ||||
| EAST1 | 41 (93.2) | ||||
| Stx2e | 1 (2.3) | ||||
| O8 | 23 (6.4) | LT | 8 (34.8) | F4 | 2 (8.7) |
| STa | 6 (26.1) | F5 | 1 (4.4) | ||
| STb | 13 (56.5) | F18 | 8 (34.8) | ||
| EAST1 | 14 (60.9) | ||||
| Stx2e | 5 (21.7) | ||||
| O116 | 14 (3.9) | LT | 13 (92.9) | F18 | 14 (100) |
| STa | 14 (100) | ||||
| STb | 14 (100) | ||||
| EAST1 | 2 (14.3) | ||||
| Stx2e | 14 (85.7) | ||||
Stx2e, Shiga toxin 2e; STa, heat-stable enterotoxin a; STb, heat-stable enterotoxin b; LT, heat-labile enterotoxin; EAST1, enteroaggregative Escherichia coli heat-stable enterotoxin 1.