FATAL IN A LESSER SPOT-NOSED GUENON ().

A 4-yr-old male intact lesser spot-nosed guenon (), housed at a North American zoological facility, presented with acute lethargy, inappetence, and mild neurologic signs. Physical examination revealed hemorrhagic pleural effusion in the right hemithorax. This guenon's condition improved over several days but then deteriorated, and the guenon presented with lethargy and weakness.