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Trichinellosis is a widespread zoonoses for which no effective drug treatment is available at this time. Though anthelmintics such as mebendazole and albendazole are commonly used to treat human trichinellosis, none of these drugs are fully effective against the encysted or new-born larvae of Trichinella spiralis. In recent years, there has been a growing interest in developing newer anthelminthics from medicinal plants, particularly the ones used in traditional medicines in many parts of the world, due to the increasing spread of anthelminthic resistance and/or decreasing activity against encapsulated larval stages of parasites. The aim of the present study was to investigate the efficacy of leaf extract of Lasia spinosa (Araceae) against different life cycle stages of T. spiralis, i.e. adult (days 3 and 4 post-infection), migrating larvae (days 8, 9 and 10 post-infection) and encysted muscle larvae (days 31–37 post …