1. New York State Department of Health, Bureau of Communicable Disease Control, Albany, New York.
2. New York State Department of Health, Wadsworth Center Diagnostic Immunology Laboratory, Albany, New York.
3. New York State Department of Health, Wadsworth Center Biodefense Laboratory, Albany, New York.
4. Centers for Disease Control and Prevention, Division of Vector-Borne Diseases, Rickettsial Zoonoses Branch, Atlanta, Georgia.
5. Current affiliation: Jiann-Ping Hsu College of Public Health, Georgia Southern University, Statesboro, Georgia.
6. Current affiliation: New York State Department of Health, Office of Health Emergency Preparedness, Menands, New York.