1. Meningitis and Vaccine Preventable Diseases Branch, Division of Bacterial Diseases, Centers for Disease Control and Prevention , Atlanta, GA , USA
2. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine , Atlanta, GA , USA
3. Georgia Emerging Infections Program , Atlanta, GA , USA
4. Department of Pediatrics, Emory University School of Medicine , Atlanta, GA , USA
5. Medical Subspecialty Section Atlanta Veterans Administration Medical Center , Atlanta, GA , USA