1. Center for Biodefense and Emerging Infectious Diseases, Sealy Center for Vaccine Development, and Department of Pathology, University of Texas Medical Branch, Galveston, Texas 77555-0609
2. Tulane National Primate Research Center, Tulane University, Covington, Louisiana 70433
3. UT Houston School of Public Health, Houston, Texas 77030
4. Diagnostic Systems and Virology Divisions, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21702-5011