1. Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Michigan Department of Community Health, Lansing, Michigan
3. Meningitis and Special Pathogens Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
4. Bioterrorism Preparedness Response Program, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
5. Office of Health and Safety, Centers for Disease Control and Prevention, Atlanta, Georgia