1. Department of Microbiology and Immunology, Mahidol University, Rajvithi Road, Bangkok 10400, Thailand
2. College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, UK
3. Health Protection Agency, Porton Down, Salisbury SP4 0JG, UK
4. Department of Biomedical Sciences, Defence Science and Technology Laboratory, Porton Down, Salisbury SP4 0JQ, UK
5. Genetic Chemistry Inc., 200 Page Mill Road, Palo Alto, CA 94306, USA
6. The Center for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand