1. Division of Infectious Diseases, Department of Medicine; Emory University School of Medicine; Atlanta GA 30322 USA
2. Department of Microbiology and Immunology; Indiana University School of Medicine; Indianapolis IN 46202 USA
3. Division of Infectious Diseases, Department of Internal Medicine; Ohio State University College of Medicine; Columbus OH 43210 USA
4. Sexual Health Clinic, Columbus Public Health; Columbus OH 43210 USA
5. Meningitis and Vaccine Preventable Diseases Branch; Centers for Disease Control and Prevention; Atlanta GA 30333 USA
6. Department of Microbiology and Immunology; Emory University School of Medicine; Atlanta GA 30322 USA