The chronic disease schistosomiasis wreaks havoc on more than 220 million people around the world, with the vast majority of cases being in sub-Saharan Africa. Despite decades of mass drug administration campaigns, schistosomiasis remains one of the world's most widespread neglected tropical diseases. Rice farmers and their families are particularly at risk, as the parasitic worms that cause the disease are spread by freshwater snails found in the standing water of rice fields.