On necropsy, a serosanguineous to purulent exudate is often found in the nasal cavities and the tympanic bullae. The lungs can have areas of firm, dark red consolidation. Fibrinopurulent pleuritis, pericarditis, and peritonitis are other changes seen on necropsy of animals affected by S. pneumoniae. Histologic lesions are consistent with necropsy findings, and bronchopneumonia of varying severity and fibrinopurulent serositis are often seen.