what causes pneumonia in cattle
Viral causes of pneumonia deserve special mention because they often precede cases of secondary bacterial pneumonia. The main viral causes of pneumonia in cattle include Infectious Bovine Rhinotracheitis (IBR), Parainfluenza 3 (PI3), Bovine Respiratory Syncyntial Virus (BRSV) and Bovine Viral Diarrhea Virus (BVD).