enzootic pneumonia of calves (Experimental Factor Ontology identifier EFO_0007256) can be described as follows. A bovine respiratory disease complex which is an infectious disease in calves involving stress and possibly an initial respiratory viral infection followed by a secondary bacterial infection of the lower respiratory tract. Mycoplasmal and bacterial agents including Pasteurella multocida, Mannheimia haemolytica, and Mycoplasma bovis represent the most frequently isolated pathogenic organisms. Also known as: Enzootic pneumonia of calves (disorder), Pneumonia of Calves, Enzootic.