Use of sequential case-control studies to investigate a community salmonella outbreak in Wales

摘要

Conclusion-Sequential case-control studies are an important and underused tool in the investigation of community outbreaks. Study objective-To establish the source of A community outbreak of Salmonella Typhimurium definitive type 124. Design -Two stage case-control study. Setting-Three districts in south east Wales. Subjects-Cases of salmonella food poi- soning and community controls. Main results-An initial case-control Study identified an association between Illness and eating ham (odds ratio 4,50, 95/100 confidence intervals 1.10, 21.8) and also found a possible association between illness and food bought from delicatessen stores (odds ratio 5.03, 95/100 confidence intervals 1.01, 32.3).