Figure 7.

The density of infectious mosquitoes as a function of the mean time to death if the fungus is the only mortality source (g_F; high values imply low virulence) for different assumptions about the additional effects of the fungus on mosquito biology. The line labelled C describes a situation where the fungus infection has no effect on mosquito feeding rate and where there are no additional effects of co-infection with Plasmodium and the fungal pathogen (a_F=a, ${\mu }_{{\text{F}}_2}=0$; we assume β=3.5 and c=0.3). The lines labelled 1A and 1B show increasing reductions in the human biting rate of fungus-infected mosquitoes to a_F=2a/3; a_F=a/3, respectively. Line 2 approximates an observed increase in the mortality of co-infected mosquitoes (${\mu }_{{\text{F}}_2}=0.09$, β₂=3.5, a_F=a) and line 3 approximates an observed reduction in transmission (${\mu }_{{\text{F}}_2}=0.17$, β₂=3.5, a_F=a).