Infeksi Balantidium coli dan Strongyloides sp. diketahui mempengaruhi kesehatan orangutan captive maupun semi-captive. Penelitian ini bertujuan untuk mengetahui perbedaan proporsi infeksi B. coli maupun Strongyloides sp. antara orangutan captive dan semi-captive, mengetahui perbedaan proporsi infeksi dan intensitas infeksi rata-rat kedua parasit berdasarkan kelompok umur dan jenis kelamin, serta asosiasi infeksi kedua spesies parasit pada kelompok orangutan captive dan semi-captive. Sampel feses telah diperiksa di laboratorium menggunakan metode pengapungan gula jenuh dan metode McMaster untuk mengidentifikasi dan menghitung jumlah telur, larva, sista, dan/atau trofozoit. Hasil penelitian ini menunjukkan tidak ada perbedaan signifikan antara infeksi B. coli pada orangutan captive dan semi-captive (χ 2 = 0,518; p<0.05). Demikian juga proporsi infeksi Strongyloides sp (χ 2 = 0,038; p<0.05). Proporsi dan intensitas infeksi rata-rata B. coli dan Strongyloides sp. tidak menunjukkan perbedaan antara orangutan captive betina ( B. coli : 16,46% dan 495,45±24,09; Strongyloides sp. : 43,94% dan 529,63±17,71) dan jantan (B. coli : 16,16% dan 433,87±22,40; Strongyloides sp. : 44,44% dan 581,52±10,01). Pada orangutan semi-captive, proporsi infeksi dan intensitas infeksi rata-rata B. coli dan Strongyloides sp. berturut-turut lebih tinggi pada orangutan betina (24,24% dan 1318,75±494,93; 51,52% dan 1394,00±1155.27) dibanding jantan (13,13% dan 900,00±707,11; 33,33% dan 1376,92±936,44). Proporsi infeksi dan intensitas infeksi rata-rata B. coli dan Strongyloides sp. berdasarkan umur orangutan captive paling tinggi pada umur remaja (20% dan 518,92±19,66; 48,46% dan 837,50±137,83), sedangkan pada orangutan semi-captive, proporsi infeksi dan intensitas infeksi rata-rata tertinggi ditemukan pada umur anak-anak (B. coli : 23,08% dan 1383,00±602,77; Strongyloides sp. : 53,85% dan 1164,00±417,05). Dari perhitungan Chi-Kuadrat, ditemukan bahwa terdapat asosiasi kuat antara infeksi B. coli dan Strongyloides sp., baik pada orangutan captive maupun semi-captive.

Balantidium coli and Strongyloides sp. infection is well-known to have impacts on the health of captive and semi-captive orangutans. The aim of this research is to study the infection proportion and mean infection intensity differences of B. coli and Stongyloides sp. in captive and semi-captive orangutans based on age and sex group, in addition to the infection association between the two parasites in orangutans from the Tanjung Puting National Park, Central Kalimantan. The samples were examined in laboratory by employing saturated sugar flotation method. Next, the samples which show positive infection of B. coli and Strongyloides sp. were analyzed utilizing McMaster method to count the number of eggs, larvae, cysts and/or trophozoids. The results showed there was no significant difference of B. coli infection (χ 2 = 0,518; p<0.05) and Strongyloides sp. infection (χ 2 = 0,038; p<0.05) between captive and semi-captive orangutans. The infection proportion and mean infection intensity of B. coli and Strongyloides sp. did not differ between captive females (B. coli : 16,46% and 495,45±24,09; Strongyloides sp. : 43,94% dan 529,63±17,71) and captive males (B. coli : 16,16% and 433,87±22,40; Strongyloides sp. : 44,44% dan 581,52±10,01). The infection proportion and mean infection intensity of B. coli and Strongyloides sp. for semicaptive orangutans were higher in females (B. coli: 24,24% and 1318,75±494,93; Strongyloides sp.: 51,52% and 1394,00±1155.27) than those in males (B. coli: 13,13% and 900,00±707,11; Strongyloides sp.: 33,33% and 1376,92±936,44). Moreover, highest infection proportion and mean infection intensity have been found in young captive orangutans of all age groups (B. coli: 20% and 518,92±19,66; Strongyloides sp. 48,46% and 837,50±137,83). On the other hand, for the semi-captive orangutans, the highest infection proportion and mean infection intensity were discovered in the children group (B. coli : 23,08% and 1383,00±602,77; Strongyloides sp. : 53,85% and 1164,00±417,05). From the Chisquare test results, it has been discovered that there was a strong assosiation between B. coli and Strongyloides sp. infection both in captive and semi-captive orangutans.

Kata Kunci : Pongo pygmaeus, Balantidium coli, Strongyloides sp., TNTP, proporsi dan intensitas infeksi.