Figure 1

The first three figures show the curves of target cells \(x(t)\) and the immune cells induced \(y(t)\) at \(\beta =0.5\), \(x(0)=10\), \(y(0)=1\), and different values of the parameters. The fourth one shows that it does not depend on the initial values of \(x(t)\), \(y(t)\) where we take another initial value \(x1(0)=11\), \(y1(0)=2\)