[1] Univ Abomey Calavi, Fac Hlth Sci, Dept Publ Hlth, 01 BP 526, Cotonou, Benin
[2] WHO, Country Off, 01BP 918, Cotonou, Benin
[3] London Sch Hyg & Trop Med, Fac Infect & Trop Dis, Dis Control Dept, London WC1E 7HT, England
[4] African Publ Hlth Consulting & Res Grp, Cotonou, Benin
[5] Cotonou Entomol Res Ctr, Minist Hlth, 06 BP 2604, Cotonou, Benin
[6] Alliance Promot Community Hlth Res & Sci Innovat, Cotonou, Benin
[7] Univ Amsterdam, Amsterdam Univ Med Ctr, Amsterdam Infect & Immunity, Ctr Trop Med & Travel Med,Dept Infect Dis,Amsterda, Locat AMC,Meibergdreef 9, NL-1105 AZ Amsterdam, Netherlands
[8] Ctr Rech Med Lambarene, BP242, Lambarene, Gabon
[9] Minist Hlth, 01 BP 882, Cotonou, Benin
[10] Univ Abomey Calavi, Fac des Sci Sante, 01 BP 526, Cotonou, Benin