TABLE 6.
Overall distribution of virulence factors in 168 human and bovine STEC isolates of serotypes O26:H11, O103:H2, O111:H8, O111:H−, O145:H−, and O157:H7 (set 3)
| Gene or characteristic | Distributiona
|
||||
|---|---|---|---|---|---|
| Overall (n = 168) | Bovine (n = 77) | Human (n = 91) | HUS + BD (n = 46) | D + NS (n = 45) | |
| ehxA | 158 (94.0) | 73 (94.8) | 85 (93.4; 0.7026) | 45 (97.8; 0.4117) | 40 (88.9; 0.2277) |
| espP | 140 (83.3) | 69 (89.6) | 71 (78.0; 0.0446) | 37 (80.4; 0.0224) | 34 (75.6; 0.0389) |
| eae | 168 (100.0) | 77 (100.0) | 91 (100.0; 1.0000) | 46 (100; 1.0000) | 45 (100; 1.0000) |
| stx1 | 129 (76.8) | 67 (87.0) | 62 (68.0; 0.0039) | 26 (56.5; 0.0001) | 36 (80.0; 0.3027) |
| stx2 | 83 (49.4) | 37 (48.1) | 46 (50.5; 0.7470) | 33 (71.7; 0.0103) | 13 (28.9; 0.0378) |
| HEp-2b | 0.991 (SD = 0.741) | 0.847 (SD = 0.557) | 1.112 (SD = 0.852; 0.0203) | 1.004 (SD = 0.682; 0.1667) | 1.223 (SD = 0.992; 0.0083) |
a
The first number in parentheses indicates the percentage of the total category positive for the respective characteristic. The second number in parentheses for the last three columns indicates the P value for the comparisons with the isolates of bovine origin in chi-square tests.
b
HEp-2, level of adherence on HEp-2 cell cultures measured in proportion to a positive control.