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Pig Journal Volume: 48
Publication date: December 2001

Proceedings Section

A CASE:CONTROL STUDY OF PMWS AND PDNS
by A.J.C. Cook, S.R. Pascoe, A.C.J. Gresham and J.W. Wilesmith

Abstract
A case: control study of PDNS/PMWS was carried out on 74 case and 71 control farms in the UK. These farms were recruited by contacting their veterinary surgeons. A wide range of potential risk factors was investigated and those that were significantly associated with either disease were included into a multi-variate model. The results showed that PDNS and PMWS are strongly associated. Risk of PDNS/PMWS was significantly greater on farms in close proximity to other affected farms. Larger farms and those that purchased greater numbers of replacement breeding stock were more likely to report PDNS/PMWS. No significant association between any other infectious condition and the presence of PDNS/PMWS was detected, although the data suggested that salmonella may be isolated more frequently from case farms. No other statistically significant feed or management related risk factors were detected. However, this may have been due to the low numbers of farms that reported certain practices or to the uniformity of the case and control farms in the study with respect to other risk factors, such as weaning age. These results are consistent with an infectious aetiology for PDNS/PMWS.

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