1. Section of Neurology
2. Section of Infectious Disease
3. Influenza Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
4. Diagnostic Virology Laboratory, Department of Pediatrics, Texas Children’s Hospital, Houston, Texas
5. Department of Neurology, Division of Neuroscience, Baylor College of Medicine, Houston, Texas