Volume 9, Number 5—May 2003
Vero Cytotoxin–Producing Escherichia coli O157 Gastroenteritis in Farm Visitors, North Wales
|OR||p value||95% CI|
||0.86 to 59.81
|Goat (high contact)
||0.54 to 44.03
|Ate ice cream
||1.04 to 137.76
|Ate cotton candy||51.90||0.008||2.77 to 970.67|
aOR, odds ratio; CI, confidence interval. Boldface type indicates variables with increased OR statistically significant at 95% level.
1C. Payne designed the case-control study, drew up the questionnaire, and analyzed and wrote up the results. M. Petrovic helped design the questionnaire, organized the data collection, and wrote the sections describing the outbreak and microbiologic findings. R.J. Roberts contributed toward the study and questionnaire design, including devising the method of selecting controls; he also helped in the final drafts of the paper. R.L. Salmon originally conceived the study, commented on the questionnaire design, and helped interpret the findings. T. Cheasty was responsible for confirmation and typing of isolates. G. Willshaw performed DNA-based comparison of strains. Other authors made important contributions to the investigation and control of the outbreak and participated in writing the paper.