SI epidemic model with phenotype-structured susceptible compartment

The dataset used in this paper is an SI epidemic model whereby the susceptible compartment is structured by a continuous variable x ∈ X, with X being an interval (possibly infinite) of R, which models the phenotypic state of every susceptible individual and takes into account interindividual variability in proliferative potential (i.e. the number of progeny produced per unit time) and resistance to infection.