Volume 14, Number 11—November 2008
Dispatch
Identification of Potential Environmentally Adapted Campylobacter jejuni Strain, United Kingdom
, Andrew Birtles, Margaret Matthews, Andrew Fox, Steven Gee, Michael Painter, Martyn Regan, Qutub Syed, and Eric Bolton
Table 2
Two-step multivariate logistic regression analysis of epidemiologic variables associated with cases of ST-45, in comparison with all other sequence types of Campylobacter jejuni *
| Variable | Univariate |
Multivariate |
|||||
|---|---|---|---|---|---|---|---|
| OR | CI | p value | OR | CI | p value | ||
| Initial model (obs = 1,008)† | |||||||
| Onset during early summer | 2.79 | 1.56–4.99 | 0.001 | 2.72 | 1.52–4.89 | 0.001 | |
| Age <5 y | 3.48 | 1.54–7.86 | 0.003 | 3.32 | 1.45–7.61 | 0.005 | |
| Rural residence | 1.96 | 1.10–3.51 | 0.023 | 2.03 | 1.13–3.66 | 0.018 | |
| Final model (controlled for above)‡ | Final multivariate (obs = 580) | ||||||
| Going fishing in the 2 weeks before illness (obs = 737) | 3.29 | 0.69–15.80 | 0.137 | 3.95 | 0.71–22.0 | 0.118 | |
| Consumption of home-delivered milk (obs = 633) | 1.99 | 0.85–4.64 | 0.113 | 2.45 | 0.97–6.17 | 0.058 | |
| Consumption of chicken at least once (obs = 645) | 0.23 | 0.08–0.66 | 0.006 | 0.21 | 0.07–0.63 | 0.006 | |
*obs, number of observations for each analysis (i.e., no. cases in the study with available information); OR, odds ratio, CI, confidence interval.
†Initial analysis of basic demographics (obs = 1,008) showed being ill in the early summer (weeks 17–28) and being <5 y of age were independently associated with cases of infection with ST-45, when controlled for the stratified variable of residential area.
‡Further analysis of exposures (controlled for the initial model) showed going fishing, consuming chicken, and consuming home-delivered milk to be independently associated with cases of infection with ST-45, and these associations remained in the final multivariate model, including all variables listed in the table. For the full regression model, only 580 of the possible 1,008 cases had information on all the variables of interest.