This file contains data for individual female snails collected from our 13 field sites in 2014 and 2015. These data were used in validating our results for variation in the proportion of sexual females between sites and for estimating the infection prevalence of sexual females. Data columns are as follows: (1) year (n=2); site (n=13); (3) length: shell length in millimeters; (4) infected: 0 for healthy, 1 for castrated with Microphallus; (5) ploidy: 2 for diploid sexual and 3 for triploid asexual
