Figure 4

a Parasite infectivity (mean/SEM number of worms established per mouse per 220 cercariae exposure) to the definitive hosts over line (p R, RU, U) and generation (p P1-F3) (pooled across replicates within line and within generation) (see Figure 1 for coding). b Virulence (mean/SEM weight of liver and spleen as a percentage of total body weight) to the definitive hosts over line (p R, RU, U) and generation (p P1-F3) (pooled across replicates within line and within generation) (see Figure 1 for coding).