Poster by S.G. Traoré , S. Costard, R. Krabi, P. Odermatt, J. Utzinger, K. Makita, D. Grace, M. Koussémon and B. Bonfoh at the 13th conference of the International Society for Veterinary Epidemiology and Economics, Maastricht, the Netherlands, 20-24 August 2012.