1. Department of Immunology and Medicine, Armed Forces Research Institute of Medical Sciences, Bangkok
2. Unité des Rickettsies, CNRS UMR 6020, Faculté de Médecine, Marseille, France
3. Laboratory of Public Health Entomology, Harvard School of Public Health, Boston, Massachusetts
4. Institut de Recherche pour le Développement, UR34, Mahidol University at Salaya, Nakorn Prathom, Thailand
5. Bao Loc General Hospital, Bao Loc, Lam Dong Province, Vietnam