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Experimental Pasteurella multocida pneumonia in calves.

R N Gourlay1, L H Thomas, S G Wyld

  • 1Agricultural and Food Research Council, Institute for Animal Health, Newbury, Berkshire.

Research in Veterinary Science
|September 1, 1989
PubMed
Summary

Pasteurella multocida caused mild pneumonia in calves after intratracheal inoculation. This bacterium should be recognized as a primary pathogen in calf respiratory disease.

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Area of Science:

  • Veterinary Pathology
  • Bacteriology

Background:

  • Pasteurella multocida is a bacterium commonly found in animal respiratory tracts.
  • Its role as a primary pathogen in calf pneumonia requires further investigation.

Purpose of the Study:

  • To investigate the pathogenicity of Pasteurella multocida in experimentally infected calves.
  • To characterize the resulting lung lesions and determine the organism's role in calf respiratory disease.

Main Methods:

  • Isolation of Pasteurella multocida from naturally deceased calves.
  • Experimental intratracheal and intravenous inoculation of healthy calves with P. multocida.
  • Clinical observation, necropsy, and histological examination of lung tissues.
  • Comparison with control groups receiving sterile broth.

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Main Results:

  • Intratracheal inoculation induced mild clinical signs and pneumonic consolidation in most calves.
  • P. multocida was re-isolated from affected lungs.
  • Intravenous inoculation resulted in milder or no disease.
  • Histopathology revealed fibrinous bronchopneumonia with necrosis and lymphatic edema.

Conclusions:

  • Pasteurella multocida can induce significant lung pathology in calves.
  • The findings support recognizing P. multocida as a primary pathogen in calf pneumonia.
  • Further research is warranted to understand its epidemiological significance.