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Find information on animal health topics, written for the veterinary professional.

* This is the Veterinary Version. *

Bovine Respiratory Disease Complex

By John Campbell, DVM, DVSc, Professor, Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan

Bovine respiratory disease (BRD) has a multifactorial etiology and develops as a result of complex interactions between environmental factors, host factors, and pathogens. Environmental factors (eg, weaning, transport, commingling, crowding, inclement weather, dust, and inadequate ventilation) serve as stressors that adversely affect the immune and nonimmune defense mechanisms of the host. In addition, certain environmental factors (eg, crowding and inadequate ventilation) can enhance the transmission of infectious agents among animals. Many infectious agents have been associated with BRD. An initial pathogen (eg, a virus) may alter the animal’s defense mechanisms, allowing colonization of the lower respiratory tract by bacteria.

* This is the Veterinary Version. *