Acknowledgements
We thank Bruno Otieno and Charles Amara for overseeing the data collection in the field, the residents of Kigoche Village and specifically the residents of our study houses for their support and willingness to participate; Billy Amugune for support with the laboratory analyses, Ibrahim Kiche for taking care of the logistics. We also thank Tom Smith, Clara Champagne and Mirjam Laager for helpful discussions on statistical modelling. Calculations were performed at sciCORE (