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Volume 14, Number 11—November 2008

Dispatch

Identification of Potential Environmentally Adapted Campylobacter jejuni Strain, United Kingdom

Will SopwithComments to Author , Andrew Birtles, Margaret Matthews, Andrew Fox, Steven Gee, Michael Painter, Martyn Regan, Qutub Syed, and Eric Bolton
Author affiliations: Health Protection Agency (North West), Liverpool, UK;

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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.

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