Experiment 7: C57BL/6 treated with four-component vaccine resulting in no clearance (α1 = 0.36, β1 = 0.007, α2 = 0.09, β4 = 6). The four-component vaccine is unable to prime the immune system to remove the infection entirely. The stable equilibrium is (P̄, Ā, Ī, B̄) ≈ (0.91, 0.15, 3.08, 0.07) with eigenvalues λ ≈ −0.07 + 0.07i, −0.78, −1.25, −0.07 −0.07i. Left panel: immune system components, right panel: bacterial component.