Global Dynamics of a Virus-Immune System with Virus-Guided Therapy and Saturation Growth of Virus

Figure 9

Phase plane of Filippov system (3) for Case with different threshold conditions. (a) The regular equilibrium and the boundary equilibrium are bistable, here ; (b) the pseudoequilibrium and the boundary equilibrium are bistable, here ; (c) the regular equilibrium and the boundary equilibrium are bistable, here ; (d) the regular equilibrium , the pseudoequilibrium and the boundary equilibrium are locally stable simultaneously, here ; (e) the regular equilibrium and the boundary equilibrium are bistable, here ; (f) the regular equilibrium and the pseudoequilibrium are bistable, here . We fix all other parameters as follows: , , , , , , , , and .

(a)

(b)

(c)

(d)

(e)

(f)