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. 2020 Sep 18;139:110296. doi: 10.1016/j.chaos.2020.110296

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Fig. 4 — Panel (a) shows the fraction of the total (primary and secondary) actively infected population over time. Panel (b) shows the fraction of the actively primary-infected population over time. Panel (c) shows the fraction of the actively secondary-infected population over time. Panels (a)–(c) consider various combinations of the immunity waning rate, ω, and the primary-transmission rate, β_p.