Disease transition arrows are in black, contacts between humans and mosquitoes are represented by the dashed arrows, and population dynamics are in grey. Susceptible humans hosts, Sh, can be infected when they are bitten by infectious mosquitoes. Infected humans become exposed (infected but not infectious), Eh, then infectious, Ih. Infectious humans recover with a constant per capita recovery rate to enter the recovered, Rh, class. Susceptible mosquito vectors, Sv, can become infected when they bite infectious humans. The infected mosquitoes then move through the exposed, Ev, and infectious, Iv, classes. Births and deaths of the population are shown as well.