1 23 Parasitology Research Founded as Zeitschrift für Parasitenkunde ISSN 0932-0113 Volume 112 Number 7 Parasitol Res (2013) 112:2681-2688 DOI 10.1007/s00436-013-3435-y In vivo anthelmintic activity of Anogeissus leiocarpus Guill & Perr (Combretaceae) against nematodes in naturally infected sheep Dramane Soro, Witabouna Mamidou Koné, Bassirou Bonfoh, Bernadin Dro, Kassédo Bénédicte Toily & Kagoyire Kamanzi