Figure 9From: 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 various \(\alpha _{{H}}\) and \(\alpha _{{V}}\). (a) \(\alpha _{{V}} =1.3405\times 10^{-6}\) and \(\alpha _{{H}}\) varies. (b) \(\alpha _{{H}} = 8.6480\times 10^{-5}\) and \(\alpha _{{V}}\) variesBack to article page