Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom; Joint Malaria Programme, P.O. Box 2228, Moshi, Tanzania; National Institute for Biological Standards and Control, South Mimms EN6 3QG, United Kingdom, Kilimanjaro Christian Medical Centre, P.O. Box 3010, Moshi, Tanzania; and Amani Medical Research Institute, National Institute for Medical Research, P.O. Box 4, Amani, Tanzania(2005-03-25時点)