Snail infections
Schistosoma mansoni (NMRI strain) and S. haematobium(Egyptian strain) eggs were collected from infected Swiss-Webster mice and Siberian hamsters, respectively, from the NIAID Schistosomiasis Resource Center. Five infected mice and hamsters each were euthanatized on dates (30 August 2011, 1 September 2011, and 6 September 2011), andS. mansoni and S. haematobium eggs were collected from the livers and intestines, respectively. Three mL egg aliquots were prepared for each schistosome species and added to the tanks within two hours. An additional three egg aliquots were placed in artificial spring water (Cohen, Neimark, & Eveland, 1980) and average egg viability is provided in Supplementary Table S3.