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Bacterial pathogens of the bovine respiratory disease complex

Dee Griffin1, M M Chengappa, Jennifer Kuszak

  • 1Great Plains Veterinary Educational Center, School of Veterinary Medicine and Biomedical Sciences, University of Nebraska - Lincoln, Clay Center, NE 68933-0148, USA. dgriffin@gpvec.unl.edu

The Veterinary Clinics of North America. Food Animal Practice
|July 13, 2010
PubMed

Insights

Bovine respiratory disease (BRD) pneumonia is often caused by bacteria like Mannheimia haemolytica, but requires other factors to cause severe illness. Understanding bacterial virulence is key to improving BRD management and vaccines.

Area of Science:

  • Veterinary Medicine
  • Microbiology
  • Animal Health

Background:

  • Bovine respiratory disease (BRD) is a major cause of cattle morbidity and mortality.
  • Bacterial pathogens, particularly Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis, are significant contributors to BRD pneumonia.
  • Disease severity often depends on interactions between bacterial virulence factors and host predisposing factors.

Purpose of the Study:

  • To review the primary bacterial pathogens involved in BRD pneumonia.
  • To discuss the virulence factors and pathogenesis of these bacteria.
  • To highlight the limitations of current management strategies and identify areas for future research.

Main Methods:

  • Literature review of bacterial pathogens causing BRD.
  • Analysis of virulence factors and disease mechanisms.
  • Evaluation of current vaccination and therapeutic practices.

Main Results:

  • Mannheimia haemolytica is a primary bacterial agent of BRD, but other pathogens like Pasteurella multocida, Histophilus somni, and Mycoplasma bovis also play crucial roles.
  • Mixed infections are common, and pathogens possess diverse virulence factors leading to similar pneumonic lesions.
  • Current vaccines and treatments for BRD are not fully effective.

Conclusions:

  • A deeper understanding of bacterial virulence mechanisms and pathogenesis is needed for BRD.
  • Investigating bacterial tissue persistence is crucial for developing improved management, therapeutics, and vaccines for BRD.

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