Recent Role of Microorganisms of the Class in the Etiology of Bovine Respiratory Disease.

Bovine respiratory disease (BRD) inflicts significant losses in cattle farming worldwide and is caused by the co-occurrence of various infectious agents which is often compounded by environmental factors. It is well known that microorganisms of the class are responsible for respiratory disorders in cattle, including BRD. This review highlights the current role of these microorganisms, in particular and , in the etiology of this disease complex, which has recently shifted toward a primary or predominant cause of the disease.