1. Central Regional Laboratory, Center for Diagnostics and Vaccine Development, Centers for Disease Control, Ministry of Health and Welfare, Taipei, Taiwan
2. Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
3. Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Taiwan
4. Department of Veterinary Medicine, National Chiayi University, Chiayi, Taiwan