TABLE 5.
Prevalence of nle genes in non-O157 STEC strains associated with outbreaks
| Genea | Prevalence (%) within STEC group (no. of strains with O-Island/ total no. of strains)
|
Odds ratio (95% CI)b | P | |
|---|---|---|---|---|
| Non-outbreak associated | Outbreak-associated | |||
| nleA | 33 (14/42) | 100 (15/15) | 61 (3.4-1,093) | <0.0001 |
| nleB | 33 (14/42) | 100 (15/15) | 61 (3.4-1,093) | <0.0001 |
| nleB2 | 14 (6/42) | 40 (6/15) | 4 (1-15.4) | NSc |
| nleC | 29 (12/42) | 87 (13/15) | 16 (3.2-83) | 0.0001 |
| nleD | 7 (3/42) | 20 (3/15) | 3.3 (0.6-18.3) | NS |
| nleE | 33 (14/42) | 93 (14/15) | 28 (3.3-235.2) | <0.0001 |
| nleF | 33 (14/42) | 87 (13/15) | 13 (2.6-65.8) | 0.0006 |
| nleG (Z6010) | 19 (8/42) | 87 (13/15) | 28 (5.2-147.7) | <0.0001 |
| nleG2-1 (Z6025) | 24 (10/42) | 87 (13/15) | 21 (4-108.3) | <0.0001 |
| nleG2-3 (Z2149) | 29 (12/42) | 93 (14/15) | 35 (4.1-296.6) | <0.0001 |
| nleG5-2 (Z2151) | 17 (7/42) | 46 (7/15) | 4.4 (1.2-16) | 0.0344 |
| nleG6-2 (Z2150) | 24 (10/42) | 67 (10/15) | 6.4 (1.8-23.2) | 0.0046 |
| nleG9 (Z2560) | 11 (5/42) | 67 (10/15) | 14.8 (3.6-61.4) | 0.0001 |
| nleH1-2 (Z6021) | 33 (14/42) | 87 (13/15) | 13 (2.6-65.8) | 0.0006 |
| nleH1-1 (Z0989) | 31 (13/42) | 93 (14/15) | 31 (3.7-263.4) | <0.0001 |
| ent/espL2 | 33 (14/42) | 100 (15/15) | 60.9 (3.4-1,093) | <0.0001 |
a
Designations in parentheses are alternate gene names used previously.
b
CI, confidence interval.
c
NS, not significant.