Fig. 5
From: Bistability and bifurcations in HIV-1 infection model with non-monotone responses
The colored regions indicate the virulence of the disease spread following the expression for \(R_0\) in (31). The red color represents the \(R_0<1\), where there is less risk of the disease or at the early stage of the infection, the yellow color represents the disease transmission starts to spread and the light green and blue color indicates the disease spread is moderate and precautions such as therapy are necessary to treat the disease. Further, the pink color indicates the spread of the disease lead to a chronic stage.
