compartmental disease transmission model Susceptible-Infected-Resistant model William R. Hogan A compartmental disease transmission model that represents some infection in ecosystem in which there are compartments for susceptible individuals, infectious individuals, and recovered individuals, such that recovered individuals are immune to future infection. Matthew Diller A compartmental disease transmission model that represents some infection in ecosystem in which there are compartments for susceptible individuals, infectious individuals, and recovered individuals, such that recovered individuals are immune to future infection.