About the Authors

Emma M. Harding-Esch

emma.harding-esch@lshtm.ac.uk

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

Tansy Edwards

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

Harran Mkocha

Affiliation Kongwa Trachoma Project, Kongwa, Tanzania

Beatriz Munoz

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

Martin J. Holland

Affiliations Clinical Research Unit, Department of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London, United Kingdom, Medical Research Council Laboratories, Fajara, Banjul, The Gambia

Sarah E. Burr

Affiliations Clinical Research Unit, Department of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, London, United Kingdom, Medical Research Council Laboratories, Fajara, Banjul, The Gambia

Ansumana Sillah

Affiliation National Eye Care Programme, Gambian Department of State for Health and Social Welfare, Banjul, The Gambia

Charlotte A. Gaydos

Affiliation Division of Infectious Diseases, Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland, United States of America

Dianne Stare

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

David C. W. Mabey

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

Robin L. Bailey

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

Sheila K. West

Affiliation Dana Center for Preventive Ophthalmology, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, 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: DCWM RLB SKW. Performed the experiments: EMH-E HM MJH SEB AS CAG DS. Analyzed the data: TE BM. Wrote the paper: EMH-E TE HM BM MJH SEB AS CAG DS DCWM RLB SKW. Coordinated the project: EMH-E Interpreted the data: EMH-E TE BM DCWM RLB SKW.