1. Division of Infectious Diseases & International Health, Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27710
2. Emergency Medicine Service, Durham Veterans Affairs Medical Center, Durham, North Carolina 27705
3. Medical and Research Services, Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, Ohio 44106
4. Departments of Medicine, Pharmacology, Molecular Biology and Microbiology, Biochemistry, and Proteomics and Bioinformatics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106
5. Duke Clinical Research Institute, Durham, North Carolina 27705;