Affiliation: | a Kilimanjaro Christian Medical College of Tumaini University, P.O. Box 2240, Moshi, Tanzania b London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK c Pan-African Malaria Vector Research Consortium (PAMVERC), UK, Benin and Tanzania; http://www.pamverc.org d Centre de Recherches Entomologique de Cotonou (CREC), Cotonou, Benin |