[1] Inst Trop Med, Vector Biol Unit, B-2000 Antwerp, Belgium
[2] Univ Pretoria, Fac Vet Sci, Dept Vet Trop Dis, ZA-0110 Pretoria, South Africa
[3] Minist Agr Elevage & Peche CeRPA, Serv Rech Dev, Cotonou 2900, Benin
[4] Univ DAbomey Calavi, EPAC, Dept Anim Prod, Cotonou 2900, Benin
[5] Minist Agr Elevage & Peche, Direct Elevage, Cotonou, Benin