1. KEMRI-Wellcome Trust Research Programme, PO Box 230-80108, Kilifi, Kenya
2. INSERM U609, Wellcome Trust Centre for Molecular Parasitology, Glasgow Biomedical Research Centre, 120 University Place, Glasgow G12 8TA, Scotland, UK
3. Department of Microbiology, Monash University, Wellington Road, Clayton, VIC 3800, Australia