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. 2022 Feb 16;157:111927. doi: 10.1016/j.chaos.2022.111927

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Fig. 1 — Flow diagram of the multi-strain mathematical model with vaccination to evaluate the spread of the current COVID-19 pandemic. S: susceptible, V: vaccinated with Pfizer, $E_{1}$ : exposed to strain one, $I_{1}$ : infected with strain one, $A_{1}$ : infected asymptomatic with strain one, $E_{2}$ : exposed to strain two, $I_{2}$ : infected with strain two, $A_{2}$ : infected asymptomatic with strain two, R: Recuperated from strain one or two and D: death by either strain one or two.