About the Authors

Lindsay R. Grant

Affiliation Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Sarah E. O’Brien

Affiliation Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Polly Burbidge

Affiliation Institute of Child Health, University College London, London, United Kingdom

Mitch Haston

Affiliation Institute of Child Health, University College London, London, United Kingdom

Marta Zancolli

Affiliation Institute of Child Health, University College London, London, United Kingdom

Lucy Cowell

Affiliation Institute of Child Health, University College London, London, United Kingdom

Marina Johnson

Affiliation Institute of Child Health, University College London, London, United Kingdom

Robert C. Weatherholtz

Affiliation Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Raymond Reid

Affiliation Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Mathuram Santosham

Affiliation Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Katherine L. O’Brien

klobrien@jhsph.edu

Affiliation Center for American Indian Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

David Goldblatt

Affiliation Institute of Child Health, University College London, London, United Kingdom

Competing Interests

KOB, LRG, RCW and RR have research grant support from GlaxoSmithKline (GSK). KOB has received honoraria for participation in external expert advisory committees on pneumococcal vaccines convened by Merck, Sanofi-Pasteur, and GSK. MS has research grant support from GSK and has received honoraria for participation in external expert advisory committees on pneumococcal vaccines convened by GSK. DG has received honoraria for participation in external expert advisory committees on pneumococcal vaccines convened by Pfizer, GSK and Merck. DG’s laboratory performs contract research for Merck and GSK. No other authors report a conflict of interest. This does not alter the authors’ adherence to all of the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: RCW RR MS KLO DG. Performed the experiments: PB MH MZ LC MJ. Analyzed the data: LRG SEO. Contributed reagents/materials/analysis tools: DG. Wrote the paper: LRG DG KLO.