Clinical Research, =IAID, NIH, Ft. Detrick, MD 5. Poxvirus Team, Poxvirus and Rabies Branch, Division of High Consequ=nce Pathogens and Pathology, National Center of Emerging Zoonoti= and Infectious Diseases, Centers for Disease Control and Prevention,*Atlanta, GA 6. Department of Pathology and Laboratory Medicine, Weill