1. 1J. Craig Venter Institute, Rockville, MD, USA
2. †Present address: Division of Microbiology and Infectious Diseases, National Institute of Allergy and Infectious Diseases, Rockville, MD, USA.
3. 2Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
4. ‡Present address: National Strategic Research Institute, Annapolis Junction, MD, USA.
5. 3Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA