1. Program in Emerging Infectious Diseases, Duke-National University of Singapore Medical School, Singapore 169857, Singapore.
2. National Large Animal Research Facility, Singapore 769199, Singapore.
3. Department of Pathology, Duke University Medical Center, Durham, NC 27705, USA.
4. Victorian Infectious Diseases Reference Laboratory, Melbourne, Victoria 3000, Australia.
5. Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
6. SingHealth Duke-NUS Global Health Institute, Singapore 169857, Singapore.