1. Welsh School of Pharmacy, Redwood Building, Cardiff University, King Edward VII Avenue, Cardiff CF10 3XF, United Kingdom; Institute of Biomedical and Life Sciences, Division of Infection & Immunity, University of Glasgow, Glasgow G12 8QQ, United Kingdom; London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, United Kingdom; and Swiss Tropical Institute, Socinstrasse 57, CH-4002 Basel, Switzerland