Fig. 2

Vector control broadens disease-free parameter space, causing disease fade-out even for high biting rates. The level of endemic disease, \(h^*\), across b–w parameter space (biting rate–drug treatment proportion) with a no vector control, b early-acting SIT releases and c late-acting SIT releases. The release ratio in b and c is \(u=0.1\) (daily releases of \(10\%\) of the wild male population), with the ratio being of the current vector population A(t) rather than the equilibrium population \(A^*\) (elsewhere in the paper the ratio of \(A^*\) is used). Disease-free regions of parameter space are coloured white. Other parameters as in Table 1