“Community-Workplace” compartmental model of disease spread in the workplace and community.

The non-employees (“Community”, shaded blue, denoted with subscript “C”) are modeled using SEPAYR (Susceptible—Exposed—Presymptomatic—Asymptomatic—sYmptomatic—Recovered) compartments. The employees (“Workplace”, shaded green, denoted with subscript “W”) additionally can move through a Detected compartment, resulting in a SEPAYDR (Susceptible—Exposed—Presymptomatic—Asymptomatic—sYmptomatic—Detected—Recovered) model that tracks the stages of COVID-19 infection and detectability by workplace testing. Compartments of individuals that are sources of infections are outlined in pink, and pink arrows denote the paths of potential infections, i.e., disease transmissions. Model transition rate parameters are denoted on compartment-to-compartment transition arrows, and their semantics are detailed in S1 Table.