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. 2023 Feb 24;616:128604. doi: 10.1016/j.physa.2023.128604

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Fig. 1 — Solutions of system (31)–(36) with three initial conditions when $R_{0} \leq 1$ . (a) Healthy epithelial cell; (b) Latent infected cells; (c) Active infected cells; (d) SARS-CoV-2 particles; (e) Antibodies; (f) CTLs.