Affiliation: | Animal and Veterinary Service, National Parks Board, Singapore (Y. Wang, J. Ong, O.W. Ng, E.Y. Koh, C.J. Fernandez, T. Huangfu, S.F. Chang, H.H. Yap);National Institute of Animal Health, Bangkok, Thailand (T. Songkasupa, K. Puangjinda);Environmental Health Institute, National Environment Agency, Singapore (J.P.S. Wong, L.C. Ng) |