TABLE 2.
Distribution of virulence factor-encoding genes in the 220 STEC strains according to the origin of the isolates
| Gene | Distributionc
|
||||
|---|---|---|---|---|---|
| Overall (n = 220) | Cattle (n = 186) | Beef (n = 18) | Cheese (n = 6) | Children (n = 10) | |
| stx1a | 34 (15) | 18 (10) | 7 (39) | 2 (33) | 7 (70) |
| stx2a | 116 (53) | 106 (57) | 9 (50) | 0 (0) | 2 (20) |
| stx1 + stx2a | 70 (32) | 62 (33) | 2 (11) | 4 (67) | 1 (10) |
| eaeb | 12 (5) | 9 (5) | 0 (0) | 0 (0) | 3 (30) |
| ehxAb | 102 (46) | 90 (48) | 6 (33) | 3 (50) | 3 (30) |
a
Number of stx-positive isolates, by PCR and hybridization.
b
Number of eae- and ehxA-positive isolates, by colony blot hybridization.
c
The number in parentheses indicates the percentage of the category positive for the respective genes.