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 characteristicDistributiona
Total (n = 112)HUS and HC (n = 54) D and NS (n = 58)
ehxA101 (90.2)50 (92.6; 0.4075)51 (87.9)
espP86 (76.8)42 (77.8; 0.8104)44 (75.9)
eae112 (100.0)54 (100.0; 1.000)58 (100.0)
stx175 (67.0)29 (53.7; 0.0040)46 (79.3)
stx260 (53.6)39 (72.2; 0.0001)21 (36.2)
HEp-2b1.144 (SD = 0.810)1.056 (SD = 0.696; 0.2662)1.227 (SD = 0.901)
  • a 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.

  • b HEp-2, level of adherence on HEp-2 cell cultures measured in proportion to a positive control.