1. Department of Internal Medicine, Division of Infectious Diseases, The University of Texas Medical Branch, Galveston, Texas 77555-0435.
2. Department of Microbiology and Immunology, Division of Infectious Diseases, The University of Texas Medical Branch, Galveston, Texas 77555-0435.
3. Monogram Sciences, Inc., South San Francisco, California 94080.
4. Department of Pathology, Division of Infectious Diseases, The University of Texas Medical Branch, Galveston, Texas 77555-0435.