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Pig Journal Volume: 58
Publication date: December 2006

Proceedings Section

INVESTIGATING SALMONELLA INFECTION ON PROBLEM PIG FARMS (ZAP LEVEL 3) - CASE STUDIES IN ENGLAND
A.J.C. Cook, A.J. Miller, S.M. Williamson, J. Hayden, C.A. Featherstone, J. O'Connor, D.F. Twomey, E.A. Marier and R.H. Davies

Abstract
This paper reviews findings from visits to pig farms in Zoonoses Action Plan (ZAP) Level 3 and describes the results of two interventions. ZAP 3 farms were predominantly infected with Salmonella enterica Typhimurium and S. Derby, similar findings to surveys and routine surveillance. Common problems included poor cleaning and disinfection, poor biosecurity and health problems including Post-weaning multisystemic wasting syndrome (PMWS). A trial of in-feed organic acid supplementation in an outdoor weaner producer failed to demonstrate any benefits, but this may have been due to a high incidence of PMWS. An intervention which included use of an oral inactivated S. Typhimurium vaccine and enhanced hygiene and biosecurity was associated with an important reduction in prevalence. However, since no control group was present, it was not possible to estimate the contribution of the vaccine to the outcome. Customised action plans can reduce the prevalence of salmonella infection on ZAP3 farms, but attention to detail is essential.

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