Cor Pulmonale and Secondary Pulmonary Arteriolar Hypertension in a Red Howler (Alouatta seniculus) Associated With Klebsiella pneumoniae Pneumonia.

A captive red howler (Alouatta seniculus) monkey developed right-sided heart failure and pulmonary arteriolar hypertension associated with a Klebsiella pneumoniae pneumonia and typhlocolitis. Clinical signs of right-sided heart failure, along with a low-grade diastolic heart murmur and diarrhea, were present.