TABLE 4.
stx genes among sorbitol-negative and sorbitol-positive STEC O157 strains belonging to different PTs
| PT (n) | stx gene(s) | Sorbitol fermentation of strains (n = 111) |
Total no. of strains (%) | |
|---|---|---|---|---|
| Negative (n = 103) | Positive (n = 8) | |||
| PT2 (59) | stx2 and stx2c | 55 | 0 | 55 (93) |
| stx2 | 4 | 0 | 4 (7) | |
| PT4 (13) | stx2 and stx2c | 5 | 0 | 5 (38) |
| stx2 | 7 | 0 | 7 (54) | |
| stx2 and stx2vhb | 1 | 0 | 1 (8) | |
| PT8 (9) | stx1 and stx2 varianta | 8 | 0 | 8 (89) |
| stx2c | 1 | 0 | 1 (11) | |
| PT14 (1) | stx2 | 1 | 0 | 1 (100) |
| PT21/28 (1) | stx1 and stx2 | 1 | 0 | 1 (100) |
| PT34 (1) | stx1 | 1 | 0 | 1 (100) |
| PT49 (10) | stx2 and stx2c | 10 | 0 | 10 (100) |
| PT50 (2) | stx2 | 2 | 0 | 2 (100) |
| PT88 (6) | stx2 | 0 | 4 | 4 (67) |
| Weak positiveb | 0 | 1 | 1 (17) | |
| Negativeb | 0 | 1 | 1 (17) | |
| RDNCc (9) | stx2 | 1 | 2 | 3 (33) |
| stx2 and stx2c | 1 | 0 | 1 (11) | |
| stx2vhb | 3 | 0 | 3 (33) | |
| stx2c | 2 | 0 | 2 (22) | |