1. Office of Global Health, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA
2. Section on Infectious Diseases, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA
3. Department of Family Medicine, West Virginia University, Ranson, WV 26506, USA
4. Department of Biology, Wake Forest University, Winston-Salem, NC 27109, USA
5. Immunization Branch, Division of Public Health, Carolina Department of Health and Human Services, Raleigh, NC 27609, USA