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. 2021 Jul 23;9:709369. doi: 10.3389/fpubh.2021.709369

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Copyright © 2021 Gumel, Iboi, Ngonghala and Ngwa.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effect of vaccination and social-distancing on time-to-elimination. Simulations of the model (2.5)–(2.6), depicting the impact of three vaccines against COVID-19 (the AstraZeneca vaccine, and the Pfizer or Moderna vaccine) and social-distancing, on time-to-elimination of the pandemic in the U.S. (A–C) Moderna or Pfizer vaccines. (D–F) AstraZeneca vaccine. The social-distancing compliance is baseline for (A,D), c_s = 0.05 for (B,E), and c_s = 0.10 for (E,F). The vaccination rates $ξ_{v} = 7.4 \times 1 0^{- 4}, 1.5 \times 1 0^{- 3}, 3.0 \times 1 0^{- 3}$ per day correspond, respectively, to vaccinating approximately 2.5 ×10⁵, 5.0 ×10⁵, 1.0 ×10⁶ people per day. The values of the other parameters of the model used in the simulation are as given in Tables 3, 4.