(A) The mean size of procercoids (um2) that did (hatched bars) and did not (open bars) successfully infect sticklebacks after 11, 14, or 17 days in copepods. Error bars represent the 95% CI and numbers within columns are sample sizes. Data from day 14 were from ref . (B) The relationship between infection probability and procercoid area predicted by logistic regressions performed separately for each of the three age groups. Only the regression at day 14 was statistically significant.