1. From the Bandim Health Project, INDEPTH Network, Bissau, Guinea-Bissau (BRD, ABF, JEN, A Rodrigues, and PA); the Bandim Health Project, Statens Serum Institut, Copenhagen, Denmark (BRD, A Roth, HR, PA, and CSB); the Medical Research Council, Fajara, The Gambia (HW); the Department of Parasitology, Leiden University Medical Center, Leiden, the Netherlands (MY and ES); the Department of Pathology,