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Schematic of SEILR(pas) model for COVID-19 progression and control measures for a Group i, i ∈ {1,2,3}. The outward arrow labeled βij implies that the encircled compartments (Presymptomatic, Asymptomatic, and Symptomatic infected) in each age group have an impact on new transmissions to the other age groups {1,…,3}.
