1. Division of Infectious Diseases, Dana-Farber Cancer Institute, Boston, Massachusetts 021151;
2. Departments of Microbiology-Immunology2and
3. Pediatrics,3 Albert Einstein College of Medicine, Bronx, New York 10461;
4. GenVec, Inc., Rockville, Maryland 208524; and
5. Department of Microbiology and Immunology, Medical College of Pennsylvania and Hahnemann University, Philadelphia, Pennsylvania 191025