In vitro inhibitory effects of plant-derived by-products against Cryptosporidium parvum Klaus Teichmann, Maxime Kuliberda, Gerd Schatzmayr, Thomas Pacher, Karin Zitterl-Eglseer, Anja Joachim and Franz Hadacek Parasite, 23 (2016) 41 Published online: 14 September 2016 DOI: 10.1051/parasite/2016050