About the Authors

Dorcas M. Kamuya

dkamuya@kemri-wellcome.org

Affiliations KEMRI-Wellcome Trust research Programme, Kilifi, Kenya, The Ethox Centre, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom

Sally J. Theobald

Affiliation Department of International Public Health, Liverpool School of Tropical Medicine, Liverpool, United Kingdom

Vicki Marsh

Affiliations KEMRI-Wellcome Trust research Programme, Kilifi, Kenya, The Ethox Centre, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom, Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom

Michael Parker

Affiliation The Ethox Centre, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom

Wenzel P. Geissler

Affiliations Department of Social Anthropology, Oslo University, Oslo, Norway, Department of Social Anthropology, University of Cambridge, Cambridge, United Kingdom

Sassy C. Molyneux

Affiliations KEMRI-Wellcome Trust research Programme, Kilifi, Kenya, The Ethox Centre, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom, Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom

Competing Interests

DMK, VM and SM work at the research centre where this research was conducted. However, this study was nested in on-going clinical research in which none of the authors are investigators. SM and VM are PLOS ONE Academic editor, this does not, however, affect the authors' adherence to PLOS ONE Editorial policies and criteria.

Author Contributions

Conceived and designed the experiments: DMK SJT VM WPG SCM. Performed the experiments: DMK SJT WPG SCM. Analyzed the data: DMK SJT VM WPG SCM. Contributed reagents/materials/analysis tools: DMK SJT VM MP WPG SCM. Wrote the paper: DMK SJT VM MP WPG SCM.