This study evaluated the molluscicidal activity in front of the snail transmitting the schistosomes (Biomphalaria glabrata) of the essential oil of Origanum vulgare. The plant material was collected in the municipality of São Luis (MA). The essential oil was extracted by hydrodistillation at 100° C for 3h, with chemical characterization through Gas Chromatography coupled to Mass Spectrometry (GC-MS). For mollus...