Division of Infectious Disease, Department of Medicine, Duke University Medical Center, and Infectious Disease Section, Durham Veterans Affairs Medical Center, Durham, North Carolina
Financial support: This work was supported by the National Institute of Allergy and Infectious Diseases (AI07392 and AI35230) and the Department of Veterans Affairs.
Reprints or correspondence: Dr. Richard Frothingham, Veterans Affairs Medical Center, 508 Fulton Street, Building 4, Durham, North Carolina 27705.
