Table 2 The sample sources and distribution of virulence factors among different O-serotype of E. coli ST131 isolates
| Characteristics | Clonal groups, number of isolates (%) | P a | ||
|---|---|---|---|---|
| All isolates (n = 83) | O25b (n = 55) | O16 (n = 28) | O25b vs O16 | |
| Source | ||||
| Urine | 55 (66.3%) | 36 (65.5%) | 19 (67.9%) | |
| Blood | 12 (14.5%) | 10 (18.2%) | 2 (7.1%) | |
| Other | 16 (19.3%) | 9 (16.4%) | 7 (25.0%) | |
| Antimicrobial resistance | ||||
| ATM | 30 (36.1%) | 24 (43.6%) | 6 (21.4%) | |
| CAZ | 22 (26.5%) | 16 (29.1%) | 6 (21.4%) | |
| CTX | 59 (71.1%) | 41 (74.5%) | 18 (64.3%) | |
| FEP | 26 (31.3%) | 22 (40.0%) | 4 (14.3%) | 0.024 |
| TZP | 1 (1.2%) | 0 | 1 (3.6%) | |
| CIP | 58 (69.9%) | 49 (89.1%) | 9 (32.1%) | < 0.001 |
| LEV | 58 (69.9%) | 49 (89.1%) | 9 (32.1%) | < 0.001 |
| AMK | 7 (8.4%) | 4 (7.3%) | 3 (10.7%) | |
| SXT | 56 (67.5%) | 36 (65.5%) | 20 (71.4%) | |
| Adhesins | ||||
| papAH | 22 (26.5%) | 19 (34.5%) | 3 (10.7%) | 0.034 |
| papC | 23 (27.7%) | 21 (38.2%) | 2 (7.1%) | 0.004 |
| papEF | 22 (26.5%) | 19 (34.5%) | 3 (10.7%) | 0.034 |
| papG allele I | 0 | 0 | 0 | |
| papG allele II | 21 (25.3%) | 18 (32.7%) | 3 (10.7%) | 0.034 |
| sfa/focDE | 1 (1.2%) | 1 (1.8%) | 0 | |
| focG | 0 | 0 | 0 | |
| afa/draBC | 7 (8.4%) | 2 (3.6%) | 5 (17.9%) | 0.040 |
| fimH | 82 (98.8%) | 54 (98.2%) | 28 (100%) | |
| gafD | 0 | 0 | 0 | |
| sfaS | 7 (8.4%) | 6 (10.9%) | 1 (3.6%) | |
| Toxins | ||||
| hlyA | 14 (16.9%) | 11 (20.0%) | 3 (10.7%) | |
| cnf1 | 10 (12.0%) | 8 (14.5%) | 2 (7.1%) | |
| cdtB | 0 | 0 | 0 | |
| cvaC | 3 (3.6%) | 1 (1.8%) | 2 (7.1%) | |
| Siderophores | ||||
| fyuA | 81 (97.6%) | 53 (96.4%) | 28 (100%) | |
| iutA | 77 (92.8%) | 52 (94.5%) | 25 (89.3%) | |
| Capsules | ||||
| kpsMTII | 62 (74.7%) | 43 (78.2%) | 19 (67.9%) | |
| kpsMTIII | 0 | 0 | 0 | |
| kpsMT K1 | 10 (12.0%) | 8 (14.5%) | 2 (7.1%) | |
| kpsMT K5 | 47 (56.6%) | 40 (72.7%) | 7 (25.0%) | < 0.001 |
| Miscellaneous | ||||
| nfaE | 0 | 0 | 0 | |
| rfc | 0 | 0 | 0 | |
| malX | 76 (91.6%) | 51 (92.7%) | 25 (89.3%) | |
| traT | 73 (88.0%) | 46 (83.6%) | 27 (96.4%) | |
| Virulence scoresb | 7 (3 to 11) | 7 (3 to 11) | 6 (4 to 10) | |