Figure 3From: Periodicity of varicella-zoster virus in the presence of immune boosting and clinical reinfection with varicellaVaricella and zoster incidences produced by (1) reach a steady equilibrium (i.e. they are both straight lines) if ζ=0.05,κ=0.6,α=0.01 and other parameter values are as in Table 1; if instead we take ζ=0.01,κ=3.0,α=0.95, varicella and zoster incidences exhibit a steady periodic behaviour.Back to article page