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Data from the British Zoonoses Action Plan Salmonella Monitoring Programme (ZAP) and from quality assurance schemes for pig producers were combined to enable epidemiological analysis. Information concerning 105,631 samples from 1,806 farms were analysed using a multi- ple logistic regression model. Results showed that pigs from farms using home mixed rations, from breeder-finisher units, kept on solid floors and from units in England were at increased risk of having a positive meat juice ELISA test result. There was a strong cluster effect. The study made use of routine data so it was not possible to consider possible confounding variables such as herd health. Introduction All farms sending pigs for slaughter through a British Quality Assured Pork (BQAP) abattoir in GB must be members of a quality assurance scheme. These schemes collect data include type of enterprise, feed use, herd size and other potential risk factors for salmonella infec- tion. Pigs from every batch delivered to all BQAP abattoirs are tested by the MJ ELISA for the ZAP scheme and these results are stored on a dedicated database. These data were combined and analysed using conventional epidemiological approaches to investigate possible risk factors for a positive MJ ELISA result. Material and Methods Data from pig quality assurance schemes in England and Scotland and from the ZAP scheme were combined in an MS ACCESS database and transferred into Stata v8 for epidemiological analyses. Each potential explanatory variable was considered independently for evidence of an association with the test result. Those that were statistically significant (p<=0.05) were incorporated into a multivariate logistic regression model and investigated for pos- sible confounding. This model was adjusted to account for clustering at the farm. Results Test results from 105,631 samples collected from 1,806

Risk factors for a positive meat juice ELISA result - an analysis of routine data from Britain