1. Molecular and Translational Sciences Division, U.S. Army Medical Research Institute of Infectious Diseases, 1425 Porter Street, Frederick, Maryland 21702, United States
2. Department of Biological Sciences, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, United States
3. Armed Forces Research Institute of Medical Sciences, Bangkok, 10400, Thailand
4. Center for Immunization Research, Johns Hopkins Bloomberg School of Public Health, 624 North Broadway, Room 251, Baltimore, Maryland 21205, United States