1. School of Public Health and Family Medicine, College of Medicine, University of Malawi, Blantyre, Malawi;
2. Center of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands;
3. Malawi-Liverpool Wellcome Trust Clinical Research Program, Queen Elizabeth Central Hospital, College of Medicine, Blantyre, Malawi;
4. Lancaster University, Lancaster Medical School, Lancaster, United Kingdom;
5. Liverpool School of Tropical Medicine, Liverpool, United Kingdom;
6. Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, The Netherlands