About the Authors

Timothy D. Minniear

Affiliations Epidemic Intelligence Service, CDC, Atlanta, Georgia, United States of America, Division of HIV/AIDS Prevention, CDC, Atlanta, Georgia, United States of America, Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, United States of America

Sonali Girde

Affiliation CDC Information Management Services, ICF International, Atlanta, Georgia, United States of America

Frank Angira

Affiliation Kenya Medical Research Institute/CDC Research and Public Health Collaboration, Kisumu, Kenya

Lisa A. Mills

Affiliations Division of HIV/AIDS Prevention, CDC, Atlanta, Georgia, United States of America, Kenya Medical Research Institute/CDC Research and Public Health Collaboration, Kisumu, Kenya

Clement Zeh

Affiliations Division of HIV/AIDS Prevention, CDC, Atlanta, Georgia, United States of America, Kenya Medical Research Institute/CDC Research and Public Health Collaboration, Kisumu, Kenya

Philip J. Peters

Affiliation Division of HIV/AIDS Prevention, CDC, Atlanta, Georgia, United States of America

Rose Masaba

Affiliation Kenya Medical Research Institute/CDC Research and Public Health Collaboration, Kisumu, Kenya

Richard Lando

Affiliation Kenya Medical Research Institute/CDC Research and Public Health Collaboration, Kisumu, Kenya

Timothy K. Thomas

Affiliation Division of HIV/AIDS Prevention, CDC, Atlanta, Georgia, United States of America

Allan W. Taylor

avt0@cdc.gov

Affiliation Division of HIV/AIDS Prevention, CDC, Atlanta, Georgia, United States of America

for the Kisumu Breastfeeding Study Team

Competing Interests

Study drugs were provided by GlaxoSmithKline and Boehringer Ingelheim. There are no patents, products in development or marketed products to declare. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: TDM LAM AWT PJP CZ FA TKT. Analyzed the data: TDM PJP SG AWT. Contributed reagents/materials/analysis tools: SG CZ FA RL. Wrote the paper: TDM PJP AWT LAM CZ FA RL RM SG TKT. Clinical exams: RL RM CZ TKT. Laboratory processing: CZ FA. Data collection: CZ FA RM RL LAM TKT.