1. Department of Immunology, Mahidol University, Bangkok, Thailand;
2. Department of Medicine, Mahidol University, Bangkok, Thailand;
3. Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand;
4. Department of Clinical Microbiology and Applied Technology, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand;
5. Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand