CLINICAL MANAGEMENT OF CHRONIC ORANGUTAN RESPIRATORY DISEASE SYNDROME IN THREE ADULT MALE BORNEAN ORANGUTANS (PONGO PYGMAEUS).

Abstract

Orangutan respiratory disease syndrome (ORDS) is a disease unique to orangutans (Pongo sp), characterized by chronic bacterial infection and inflammation of any region or combination of regions of the respiratory tract, including the sinuses, air sacs, cranial bones, airways, and lung parenchyma. Aggressive early intervention during a first episode may prevent progression to chronic disease. However, in the setting of an established chronic disease, intermittent acute exacerbations are associated with worsening symptoms and increased infection and inflammation. ORDS is ultimately fatal due to loss of respiratory function resulting from chronic structural damage. Utilizing potentially lifelong medications to slow the progression of chronic, destructive inflammation in the respiratory tract, chronic treatment is aimed at stabilizing the animals' respiratory function, decreasing the frequency of recurrent exacerbations, and improving their general well-being. Three adult male Bornean orangutans (Pongo pygmaeus) housed at an orangutan rehabilitation and reintroduction center in Indonesia have long histories of recurrent respiratory disease. Each underwent CT scans confirming ORDS with chronic airway disease prior to initiation of a long-term treatment protocol. Based on data-driven medical management of bronchiectasis in humans, the three orangutans have been treated with long-term combination regimens of oral azithromycin, nebulized salbutamol, and nebulized hypertonic saline. Follow-up CT scans in all three animals at least 1 yr following treatment initiation showed improvements throughout their respiratory tracts. The duration of each exacerbation period decreased, and the orangutans have longer symptom-free periods compared to before the start of treatment. At an average of 5 yr into the long-term treatment protocol, all three orangutans are thriving. Chronic medical management of ORDS modeled after human treatment of bronchiectasis has been efficacious in these three orangutans and encourages further study of this approach.