1. Department of Immunology and Medicine, United States Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand.
2. Leonard Wood Memorial Center for Leprosy Research, Cebu, Philippines
3. Rickettsial Diseases Department, Naval Medical Research Center, Silver Spring, Maryland
4. Division of Research, Royal Thai Army Component, AFRIMS, Bangkok, Thailand.
5. Department of Virology, United States Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand