1Medical Service (Infectious Disease Section), Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
2Departments of Medicine, Houston, Texas
3Departments of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas
4Departments of St. Luke's Episcopal Hospital, Houston, Texas
5Wellstar/Kennestone Hospital, Marietta, Georgia
6Pennsylvania State College of Medicine, Hershey
7Lehigh Valley Hospital, Allentown, Pennsylvania
8The Romark Institute for Medical Research, Tampa, Florida
Reprints or correspondence: Dr. Daniel M. Musher, Infectious Disease Section-Rm. 4B-370, Michael E. DeBakey Veterans Affairs Medical Center, 2002 Holcombe Blvd., Houston, TX 77030([email protected]).