1. Department of Pediatric Infectious Diseases, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan
2. Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8523, Japan
3. Center for Microbiology Research, Kenya Medical Research Institute, Nairobi 54840-00200, Kenya
4. Department of Bacteriology, National Institute of Hygiene and Epidemiology, Hanoi 100000, Vietnam
5. Department of Pediatrics, Khanh Hoa General Hospital, Nha Trang 650000, Vietnam
6. Khanh Hoa Health Service Department, Nha Trang 650000, Vietnam