Sarcocystosis among wild captive and zoo animals in Malaysia

• Main Authors: Abdullah, S. (Author), Desa, N.M (Author), Latif, B. (Author), Omar, E. (Author), Vellayan, S. (Author)
• Format: Article
• Language: English
• Subjects: animal tissue; Animalia; Animals; Animals, Wild; Animals, Zoo; article; Aves; bird; Captive wild animal; Cell Size; controlled study; cyst (resting stage); female; infection rate; lung edema; lung hemorrhage; Malaysia; male; Mammalia; microscopy; muscle atrophy; Muscle, Skeletal; nonhuman; parasite identification; parasite localization; Sarcocystis; Sarcocystis sp.; sarcocystosis; Sarcocystosis; species identification; wild animal; zoo animal; Zoo animal
• Online Access: View Fulltext in Publisher; View in Scopus
• ISBN: 00234001 (ISSN)
• DOI: 10.3347/kjp.2010.48.3.213

Sarcocystis sp. infection was investigated in 20 necropsied captive wild mammals and 20 birds in 2 petting zoos in Malaysia. The gross post-mortem lesions in mammals showed marbling of the liver with uniform congestion of the intestine, and for birds, there was atrophy of the sternal muscles with hemorrhage and edema of the lungs in 2 birds. Naked eye examination was used for detection of macroscopic sarcocysts, and muscle squash for microscopic type. Only microscopically visible cysts were detected in 8 animals and species identification was not possible. Histological examination of the sections of infected skeletal muscles showed more than 5 sarcocysts in each specimen. No leukocytic infiltration was seen in affected organs. The shape of the cysts was elongated or circular, and the mean size reached 254 × 24.5 μm and the thickness of the wall up to 2.5 mm. Two stages were recognized in the cysts, the peripheral metrocytes and large numbers of crescent shaped merozoites. Out of 40 animals examined, 3 mammals and 5 birds were positive (20%). The infection rate was 15% and 25% in mammals and birds, respectively. Regarding the organs, the infection rate was 50% in the skeletal muscles followed by tongue and heart (37.5%), diaphragm (25%), and esophagus (12.5%). Further ultra- structural studies are required to identify the species of Sarcocystis that infect captive wild animals and their possible role in zoonosis.