Infected and uninfected frogs separated by year, stage class, and season. The number of captures and the prevalence of Bd varies among the three stage classes of R. pipiens and among the three seasons. The numbers of Bd-infected and uninfected captures are shown in black and white, respectively. The three stage classes are young of the year, juveniles, and adults, and are abbreviated on the x-axis as Y, J, and A, respectively. The vertical dashed lines separate the three seasons: spring, summer, and fall. The panels show the four different years: 2003, 2005, 2006, and 2007. Captures are pooled across the two locations (CVWMA, BFWMA).