[1] Univ London Imperial Coll Sci Technol & Med, Dept Infect Dis Epidemiol, Schistosomiasis Control Initiat, London W2 1PG, England
[2] Minist Sante Publ, Programme Natl Lutte Bilharziose & Geohelminthes, Niamey, Niger
[3] Nat Hist Museum, Dept Zool, Wolfson Wellcome Biomed Labs, London SW7 5BD, England
[4] WHO, Dept Control Neglected Trop Dis, CH-1211 Geneva 27, Switzerland
[5] Univ Queensland, Sch Populat Hlth, Herston, Qld 4006, Australia
[6] Queensland Inst Med Res, Australian Ctr Int & Trop Hlth, Herston, Qld 4006, Australia
[7] Minist Hlth, Vector Control Div, Kampala, Uganda
[8] Minist Sante, Programme Natl Lutte Schistosomiase & Vers Intest, Ouagadougou, Burkina Faso
[9] PNLSH Quartier Fleuve, Programme Natl Lutte Schistosomiase, Bamako, Mali
[10] Minist Hlth & Social Welf, Natl Sch Hlth Programme, Natl Schistosomiasis & Soil Transmitted Helminth, Dar Es Salaam, Tanzania
[11] Univ Teaching Hosp, Dept Pathol & Microbiol, Lusaka, Zambia