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Bacterial pathogens associated with lung lesions in slaughter pigs from 125 herds

C Fablet1, C Marois, V Dorenlor

  • 1Agence Nationale de Sécurité Sanitaire (Anses), Unité Epidémiologie et Bien-Etre du Porc, B.P. 53, 22440 Ploufragan, France. christelle.fablet@anses.fr

Research in Veterinary Science
|December 3, 2011
PubMed

Insights

Controlling Mycoplasma hyopneumoniae (Mhp) and Pasteurella multocida (Pm) significantly reduces pneumonia in pigs. Actinobacillus pleuropneumoniae (App) control is also crucial for reducing pleuritis.

Area of Science:

  • Veterinary Pathology
  • Swine Disease Diagnostics
  • Bacterial Pneumonia in Livestock

Background:

  • Bovine respiratory disease complex is a significant issue in swine production.
  • Macroscopic lung lesions are common in slaughter pigs.
  • Identifying causative agents is key for effective disease control.

Purpose of the Study:

  • To assess the relationship between lung lesions and specific bacterial pathogens detected by PCR in slaughter pigs.
  • To determine the prevalence of Mycoplasma hyopneumoniae (Mhp), Pasteurella multocida (Pm), Actinobacillus pleuropneumoniae (App), Haemophilus parasuis (Hps), and Streptococcus suis (Ssuis).
  • To inform targeted control strategies for respiratory diseases in swine herds.

Main Methods:

  • Analysis of macroscopic lung lesions (pneumonia, pleuritis) in 3731 slaughter pigs from 125 French herds.
  • Polymerase Chain Reaction (PCR) testing for Mhp, Pm, App, Hps, and Ssuis.
  • Statistical assessment of associations between lesions and pathogen detection at both individual pig and herd levels.

Main Results:

  • Pneumonia (69.3%) and pleuritis (15%) were the most frequent lesions.
  • Mhp (69.3%) and Pm (36.9%) were highly prevalent and associated with pneumonia.
  • App was linked to pleuritis at the herd level, while Mhp and Pm were linked to pneumonia at both pig and herd levels.

Conclusions:

  • Control measures targeting Mhp and Pm are essential for reducing pneumonia incidence.
  • Addressing App is important for mitigating pleuritis, particularly at the herd level.
  • Integrated control strategies for Mhp, Pm, and App can significantly decrease the occurrence of both pneumonia and pleuritis in swine populations.

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