Abstract
The risk of transmitting novel pathogens from released animals to wild conspecifics is an important consideration for reintroduction initiatives. Apart from infecting humans, hepatitis B virus (HBV) has been detected in nonhuman primates, including captive gibbons. Gibbons that test positive for HBV are removed from reintroduction programs as the presence of infection in wild populations is uncertain. The aim of this study was to determine the prevalence of HBV in wild-living gibbon populations in the southwest and northeast of Cambodia and compare HBV DNA strains collected from these animals with samples from wild-born captive gibbons at the Phnom Tamao Wildlife Rescue Center, Cambodia. We screened HBV infection in blood and stool samples from captive gibbons and stool samples from wild-living gibbons. We sequenced samples with detectable HBV DNA viral load in the HBV reverse transcriptase coding region overlapping with the S-gene. Eleven of twenty-four (46 %) wild-living pileated gibbons (Hylobates pileatus) from the southwest of Cambodia were positive for HBV. Phylogenetic analysis of HBV DNA sequenced from wild and captive gibbons revealed that viral strains were related and different from human strains. The presence of an HBV variant circulating in the wild similar to that found in captive pileated gibbons suggests 1) the strain identified is associated with the species, 2) wild-born captive gibbons positive for this strain became infected prior to captivity, and 3) it might be appropriate to release captive gibbons that test positive for specific serological markers of HBV, provided they are otherwise suitable candidates for reintroduction.
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Acknowledgements
The authors would like to thank the following organizations and individuals for their support and assistance in this research: Wildlife Reserves Singapore (WRS) for providing the total funding in both years of research into this important study; Dr Sonja Luz for her support and particularly for her understanding when confronted with the unexpected; the Aspinall Foundation, which conducted a similar research and whose support and advice contributed greatly to this study; Dr. Jane Hopper, whose unpublished paper on HBV in wild gibbons, implemented by the Aspinall Foundation, gave guidance; Mr. Ernie Thetford, for his advice and expertise on all things primate; Mr. Nhek Ratanapich, Director of Phnom Tamao Wildlife Rescue Centre, for his agreement and support for this and many other projects concerning the welfare of his animals; Wildlife Alliance staff involved at Phnom Tamao Wildlife Rescue Centre and at our Wildlife Release Station in Koh Kong province, who would otherwise have gone unnoticed, particularly vets Oung Chenda, Ruos San and Oung Chamroeun and head keeper Try Sitheng at PTWRC and Chhean Soeun, Toeur Savat and Kong Vang in Koh Kong; and the Cambodian Forestry Administration, Ministry of Agriculture Forestry and Fisheries for its support. We also thank the editor and reviewers for all their thoughtful comments and assistance with improving our report.
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François Rouet is deceased. This paper is dedicated to his memory.
- François Rouet
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NM and RB formulated the idea. NM, JN, and RB developed methodology and experiment design. NL, RB, and NM organized and oversaw field work to collect samples. JN, SP, FR, and PD developed methodology for and preformed laboratory analysis of samples. NL, JN, PD and NM wrote the manuscript and the other authors provided input and editorial advice.
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Leroux, N., Nouhin, J., Prak, S. et al. Prevalence and Phylogenetic Analysis of Hepatitis B in Captive and Wild-Living Pileated Gibbons (Hylobates pileatus) in Cambodia. Int J Primatol 41, 634–653 (2020). https://doi.org/10.1007/s10764-020-00168-1
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DOI: https://doi.org/10.1007/s10764-020-00168-1