Chronic pneumonia and polyarthritis syndrome in a feedlot calf

A feedlot heifer was diagnosed with chronic pneumonia and polyarthritis syndrome (CPPS), which was confirmed on postmortem examination. The syndrome is caused by Mycoplasma bovis; however, available data support the theory that other pathogens play a role in predisposing to this disease. Continued research on CPPS focuses on pathogenesis, treatment, and prevention.