Figure 6From: Mathematical evaluation of the role of cross immunity and nonlinear incidence rate on the transmission dynamics of two dengue serotypesShowing the region of secondary infection covered by the functions \(f_{{1}}\) and \(f_{{2}}\) given in (4.4) with \(\lambda =0.0714\) (brown solid), 0.0110 (blue dashed), 0.0037 (red dashdot), and 0.0014 (green solid)Back to article page