Fig. 5: Compartments of the epidemic model for COVID-19.
From: Rebound in epidemic control: how misaligned vaccination timing amplifies infection peaks

The acronyms correspond to susceptible (\({S}_{v}^{g}\)), exposed (\({E}_{v}^{g}\)), asymptomatic infectious (\({A}_{v}^{g}\)), symptomatic infectious (\({I}_{v}^{g}\)), pre-hospitalized in ICU (\({P}_{Hv}^{g}\)), pre-deceased (\({P}_{Dv}^{g}\)), in ICU before recovery (\({H}_{Rv}^{g}\)), in ICU before death (\({H}_{Dv}^{g}\)), deceased (\({D}_{v}^{g}\)), and recovered (\({R}_{v}^{g}\)), where g denotes the age stratum of all compartments and v the vaccination status. The arrows indicate the transition probabilities.