Table 3.

SIR Model variables.

Initial values of state variables:
• SusceptiblePopulationS = TotalPopulationN − InfectiousPopulationI − RecoveredPopulationR
• InfectiousPopulationI = InitialInfectiousPopulation
• RecoveredPopulationR = 0
Changes in state variables:
• d(SusceptiblePopulationS)/dt = − InfectionRate
• d(InfectiousPopulationI)/dt = InfectionRate − RecoveryRate
• d(RecoveredPopulationR) = RecoveryRate
Flows:
• InfectionRate = ContactRateC * InfectivityI * SusceptiblePopulationS * InfectiousPopulationI/TotalPopulationN
• RecoveryRate = InfectiousPopulationI/AverageDurationOfIllnessD

Variables in the SD-SIR model for behavior dynamics.