Table 2. Comparative distributions of the most common MLST clonal complexes by study area, April 2003 to March 2004*.
| Clonal complex | Isolates |
Incidence/100,000 |
Incidence ratio | 95% confidence intervals | p value | ||
|---|---|---|---|---|---|---|---|
| Rural | Suburban | Rural | Suburban | ||||
| ST–21 | 36 | 66 | 19.91 | 15.50 | 1.28 | 0.83–1.96 | – |
| ST–45 | 21 | 14 | 11.61 | 3.29 | 3.53 | 1.71–7.51 | <0.001 |
| UA | 12 | 22 | 6.64 | 5.17 | 1.28 | 0.58–2.71 | – |
| ST–257 | 9 | 19 | 4.98 | 4.46 | 1.12 | 0.44–2.59 | – |
| ST–443 | 6 | 15 | 3.32 | 3.52 | 1.01 | 0.32–2.80 | – |
| ST–48 | 6 | 13 | 3.32 | 3.05 | 1.09 | 0.34–3.07 | – |
| ST–206 | 8 | 10 | 4.42 | 2.35 | 1.88 | 0.65–5.30 | – |
| ST–353 | 4 | 9 | 2.21 | 2.11 | 1.05 | 0.24–3.75 | – |
| ST–22 | 2 | 5 | 1.11 | 1.17 | 0.94 | 0.09–5.75 | – |
| ST–49 | 2 | 5 | 1.11 | 1.17 | 0.94 | 0.09–5.75 | – |
| C. coli | 16 | 14 | 8.85 | 3.29 | 2.69 | 1.23–5.95 | <0.01 |
| All cases† | 181 | 312 | 100.08 | 73.25 | 1.37 | 1.13–1.65 | <0.001 |
*Including UA (new sequence types as yet unassigned to a clonal complex), Campylobacter coli isolates, and all cases of campylobacteriosis reported. Annual estimated incidence was calculated for each clonal complex and incidence ratios were calculated for rural incidence/suburban incidence, including confidence intervals. Those data with a statistically significant difference between the study areas are shown in boldface type (level of significance p<0.05). MLST, multilocus sequence typing. †Refers to the entire dataset for reference, i.e., those shown in this table plus all others.