TABLE 3.
Distribution of complete O-Islands in outbreak strains
| Complete O-Island | Prevalence (%) within STEC group (no. of strains with O-Island/ total no. of strains)
|
Odds ratio (95% CI)a | P | |
|---|---|---|---|---|
| Non-outbreak associated | Outbreak associated | |||
| O-Island 36 | 7 (3/42) | 20 (3/15) | 3.3 (0.6-18.3) | NSb |
| O-Island 57 | 17 (7/42) | 46 (7/15) | 4.4 (1.2-16.0) | <0.05 |
| O-Island 71 | 11 (5/42) | 67 (10/15) | 14.8 (3.6-61.4) | 0.0001 |
| O-Island 122 | 33 (14/42) | 93 (14/15) | 28 (3.3-235.2) | <0.0001 |
a
CI, confidence interval.
b
NS, not significant.