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Figure 2 | Theoretical Biology and Medical Modelling

Figure 2

From: Periodicity of varicella-zoster virus in the presence of immune boosting and clinical reinfection with varicella

Figure 2

Hopf curves for selected parameter pairs: (a) β is a varicella transmission coefficient and ζ is a varicella force of infection reduction coefficient for those who become reinfected following clearance of varicella; (b) σ is a loss of full immunity rate and δ is a rate of HZ reactivation after loss of immunity following recovery from HZ; (c) θ is a rate of loss of immunity to VZV after recovery from HZ and κ is a boosting coefficient; (d) α is a varicella force of infection reduction coefficient for those who become reinfected following HZ attack and η is a HZ reactivation rate. Shaded areas limited by these curves correspond to periodic solutions of (1).

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Theoretical Biology and Medical Modelling

ISSN: 1742-4682