Fig. 1.

Flow diagram of the model. Simulated population is stratified in compartments by HIV infection status and progression towards AIDS during five disease phases. Infected individuals are additionally stratified by treatment status as undiagnosed (compartments I), diagnosed who are not in care (compartments D), diagnosed in care not in treatment (compartment E), diagnosed on ART but virally unsuppressed (compartment U) and diagnosed on ART virally suppressed (compartment T). MSM who become sexually active join the susceptible compartment (S) at constant rate. Population is additionally stratified by age, HIV risk and sexual positioning which is not shown in the diagram. A complete description of the model including the expressions for the forces of infections (λ) is presented in the Supplement.