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. 2021 May 4;337:108614. doi: 10.1016/j.mbs.2021.108614

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Fig. 3 — Feasibility region for vaccine reproduction number. The vaccine reproduction number $R_{V}$ is plotted as a function of vaccine efficacy ( $ε_{V}$ ) and vaccination rate ( $ψ_{V}$ ). Gray shaded region, corresponds to $R_{V} > 1$ . White region, denotes when $R_{V} < 1$ . Red region is biologically unfeasible.