Change in B. dendrobatidis ( Bd ) infection status and mass of initially uninfected frogs ( Pelophylax esculentus and P. lessonae , N = 53) in each experimental treatment. (a) Proportion of frogs that became infected during the experiment and mean (± SE) infection load expressed as log(zoospore equivalents + 1). Asterisk indicates infection was detected in one control frog that may have had an undetectable infection before the experiment. (b) Mean percent (± SE) mass gain of frogs in each treatment. Letters above bars indicate homogeneous subsets based on a Tukey post-hoc test.