From: Conceptual analysis of the combined effects of vaccination, therapeutic actions, and human subjection to physical constraint in reducing the prevalence of COVID-19 using the homotopy perturbation method
\(S_{e3} (t)\)
\(0 \le E_{r} \le 10^{ - 1}\)
\(E_{e3} (t)\)
\(I_{e3} (t)\)
\(0 \le E_{r} \le 10^{ - 5}\)
\(Q_{e3} (t)\)
\(0 \le E_{r} \le 10^{ - 2}\)
\(R_{e3} (t)\)