Fig. 7

2-D Contour plot of the reproduction number \({\mathcal {R}}_{0}\) of Lassa fever model (1), a varying recovery rate of humans with respect to transmission probability from human-to-human. b varying recovery rate of humans with respect to transmission probability from rodent-to-rodent. c transmission probability from rodent-to-rodent with respect to transmission probability from human-to-human. d natural death of rodents with respect to transmission probability from rodent-to-rodent. The parameter values used are as given in Table 2 except for \(\delta _{h}=0.2911\) and \(\mu _{r}=0.3840\), so that \({\mathcal {R}}_{0}=0.43 < 1\)