obsolete_bovine respiratory disease complex true Sirarat Sarntivijai DOID:3732 3.88.0 A pneumonia which has a multifactorial etiology and develops as a result of complex interactions between environmental factors, host factors, and pathogens leading to pulmonary lesions caused by various micro organisms ( essentially viruses and bacteria). Environmental factors (eg, weaning, transport, commingling, crowding, 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. http://purl.obolibrary.org/obo/MONDO_0005678 MESH:D048090 Replaced by Mondo term MONDO_0005678, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0005678 Bovine Respiratory Disease Complex