The individual-based model SIMCOLEP simulates thespread of M. leprae in a population structured in households. Dynamics of the population are described bybirths, movements between households, and deaths.Births are determined by birth rates and newborns are placed in the household of their mother. Movements ofindividuals to another newly created or existing household occur after marriage, during adolescence or afterbecoming a widow(er). Deaths are determined by deathrates [6].