TABLE 5.
Overall distribution of virulence factors in 112 human STEC isolates of serotypes O26:H11, O26:H−, O103:H2, O111:H8, O111:H−, O145:H−, O157:H7, and O157:H− isolated from individuals with severe disease or with either uncomplicated diarrhea or no symptoms (set 2)
| Gene or characteristic | Distributiona
|
||
|---|---|---|---|
| Total (n = 112) | HUS and HC (n = 54) | D and NS (n = 58) | |
| ehxA | 101 (90.2) | 50 (92.6; 0.4075) | 51 (87.9) |
| espP | 86 (76.8) | 42 (77.8; 0.8104) | 44 (75.9) |
| eae | 112 (100.0) | 54 (100.0; 1.000) | 58 (100.0) |
| stx1 | 75 (67.0) | 29 (53.7; 0.0040) | 46 (79.3) |
| stx2 | 60 (53.6) | 39 (72.2; 0.0001) | 21 (36.2) |
| HEp-2b | 1.144 (SD = 0.810) | 1.056 (SD = 0.696; 0.2662) | 1.227 (SD = 0.901) |
BD, bloody diarrhea; D, uncomplicated diarrhea; NS, no symptoms. The first number in parentheses indicates the percentage of the total category positive for the characteristic. The second number in parentheses for the third column indicates the P value for a chi-square test comparing isolates from severely diseased patients with those from patients with uncomplicated diarrhea and healthy individuals.
HEp-2, level of adherence on HEp-2 cell cultures measured in proportion to a positive control.