[1] Biomed Primate Res Ctr, Dept Parasitol, NL-2280 GH Rijswijk, Netherlands
[2] Natl Hosp & Univ CNHU, Parasitol Ctr, Cotonou, Benin
[3] Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Dis, London WC1E 7HT, England
[4] UNB, Fac Sci & Tech, Dept Biochim & Biol Cellulaire, Cotonou, Benin