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Pig Journal Volume: 58
Publication date: December 2006

Proceedings Section

VIRAL PNEUMONIA IN PIGS IN ENGLAND AND WALES 1999 - 2005
G.Jackson, C.A. Bidewell, N.G.A. Woodger, S.M. Williamson, R.J. Higgins, J.-P. Frossard, I.H. Brown, J.B.M. Ryan, S. Robertson, B. Naidu, M. Banks, T.W. Drew and A.J.C. Cook.

Abstract
An overview of pig disease trends illustrates the pattern and relative importance of porcine circovirus 2 (PCV2)-associated disease, principally post-weaning multisystemic wasting syndrome (PMWS), since its first recognition in England and Wales (E & W) in 1999. A study during 2005 into raised-mortality in growing and finishing pigs highlighted the major involvement of PCV2-associated diseases including pneumonia. The study's findings also supported the view that classic PMWS has evolved since 1999, and increasingly occurs as more variable syndromes, including other PCV2-associated diseases. These diseases also more commonly affect older, often in fair to good condition, pigs. Disease trends of porcine reproductive and respiratory syndrome (PRRS) and influenza A virus (IAV) diseases probably under-estimate their contribution to national pig disease. The raised mortality study, however, highlighted their relative importance in viral pneumonias in the 10 to 20-week age group. Monitoring of viral strains demonstrated increasing diversity of PRRSV isolates, but relative stability of IAV isolates, from pig disease incidents in E & W during the 1990s to the end of 2005.

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