Figure 2

Parasite prevalence following chemotherapeutic control of P1. P2 and co-infection are the solid and broken lines on the left y-axis, P1 is the thick black line on the right y-axis. The between-parasite species interactions for these four scenarios are: A) P1 reduces both host susceptibility to, and fecundity of, P2 (−/−); B) P1 reduces host susceptibility to, but increases fecundity of, P2 (−/+); C) P1 increases host susceptibility to, but reduces fecundity of, P2 (+/−); D) P1 increases host susceptibility to, and increases fecundity of, P2 (+/+).