[contentcards url=”https://www.sciencemag.org/news/2018/08/tropical-parasitic-disease-has-invaded-europe-thanks-hybrid-two-infectious-worms” target=”_blank”] By Elizabeth Pennisi MONTPELLIER, FRANCE—Infecting an estimated 230 million people, schistosomiasis is the world’s most widespread parasitic disease after malaria. But temperate…