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. 2020 Jun 25;139:110030. doi: 10.1016/j.chaos.2020.110030

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Fig. 11 — Illustration of the forward bifurcation process from I_h versus $δ = σ β_{c}$ for the COVID-19 system (10) with $β_{r} = 0.03$ and also with $Λ_{p} = 1000, Λ_{r} = 2500, μ_{h} = 0.0131, μ_{c} = 0.035$ and $κ_{c} = 199 \times 10^{- 4} .$