1. Rabies Section, Viral and Rickettsial Zoonoses Branch, Division of Viral and Rickettsial Diseases, Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333, USA
2. State Health Office, Florida Department of Health and Rehabilitative Services, Tallahassee, Florida 32399, USA
3. Office of Laboratory Services, Florida Department of Health and Rehabilitative Services, P.O. Box 210, Jacksonville, Florida 32210, USA