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Risk factors for Actinobacillus pleuropneumoniae serotype 2 infection in Danish genetic specific pathogen-free pig herds
  1. Q. Zhuang, DVM, PhD1,
  2. K. Barfod, DVM1,
  3. H. Wachmann, MSc, PhD1,
  4. S. Mortensen, DVM, PhD2,
  5. D. T. Lavritsen3,
  6. B. Ydesen, MSc1 and
  7. P. Willeberg, DVM, DrMedVet2
  1. 1 Danish Bacon and Meat Council, Axelborg, Axeltorv 3, DK-1609 Copenhagen V, Denmark
  2. 2 Danish Veterinary and Food Administration, Mørkhøj Bygade 19, DK-2860 Søborg, Denmark
  3. 3 Danish Institute for Food and Veterinary Research, Bülowsvej 13, DK-1870 Frederiksberg C, Denmark

Abstract

Between 1994 and 1998, 297 genetic specific pathogen-free (spf) pig herds participated in a monthly clinical and serological monitoring programme for infection with Actinobacillus pleuropneumoniae serotype 2 (ap-2). The average annual herd-level incidence was 3·4 per cent but there was a significant decreasing trend. A risk index, summing up the exposure from ap-2-infected neighbouring pigs within a 3 km radius, was derived from a geographical information system. A survival analysis indicates that the risk of ap-2 infection increased in proportion to the risk index, suggesting that local spread of ap-2 from infected neighbours was a significant factor. However, herd-specific purchase policies were not apparently associated with the risk of ap-2 infection.

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