1. Departments of Medicine, University of California at San Francisco, San Francisco
2. Epidemiology Program, School of Public Health, University of California at Berkeley, Atlanta, Georgia
3. Departments of Dermatology, University of California at San Francisco, San Francisco
4. Viral and Rickettsial Zoonoses Branch, Division of Viral and Rickettsial Diseases, Atlanta, Georgia
5. Departments of Laboratory Medicine, University of California at San Francisco, San Francisco
6. Meningitis and Special Pathogens Branch, Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia