About the Authors

Abdou Amza

Affiliation Programme National de Lutte Contre la Cecité, Niamey, Niger

Boubacar Kadri

Affiliation Programme National de Lutte Contre la Cecité, Niamey, Niger

Baido Nassirou

Affiliation Programme National de Lutte Contre la Cecité, Niamey, Niger

Nicole E. Stoller

Affiliation F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America

Sun N. Yu

Affiliation F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America

Zhaoxia Zhou

Affiliation F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America

Stephanie Chin

Affiliation F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America

Sheila K. West

Affiliation Dana Center for Preventive Ophthalmology, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America

Robin L. Bailey

Affiliation Clinical Research Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom

David C. W. Mabey

Affiliation Clinical Research Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom

Jeremy D. Keenan

Affiliations F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America, Department of Ophthalmology, University of California San Francisco, San Francisco, California, United States of America

Travis C. Porco

Affiliations F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America, Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, United States of America, Institute for Global Health, University of California San Francisco, San Francisco, California, United States of America, Center for Infectious Disease and Emergency Readiness, University of California, Berkeley, California, United States of America

Thomas M. Lietman

Affiliations F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America, Department of Ophthalmology, University of California San Francisco, San Francisco, California, United States of America, Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, United States of America, Institute for Global Health, University of California San Francisco, San Francisco, California, United States of America

Bruce D. Gaynor

bruce.gaynor@ucsf.edu

Affiliations F.I. Proctor Foundation, University of California San Francisco, San Francisco, California, United States of America, Department of Ophthalmology, University of California San Francisco, San Francisco, California, United States of America

for the PRET Partnership

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SKW RLB DCWM JDK TCP TML BDG. Performed the experiments: AA BK BN NES SNY ZZ SC JDK TML BDG. Analyzed the data: ZZ SC JDK TCP TML BDG. Contributed reagents/materials/analysis tools: ZZ SC TML BDG. Wrote the paper: AA NES SNY JDK TCP TML BDG.