In order to assess the potential impact of the combined TasP and PrEP interventions, the investigators will first compare the HIV incidence observed during the study to the 1.4 per 100 person-years incidence estimate from a follow-up study carried out among FSWs in Cotonou in the early 2010s. However, more importantly in terms of impact assessment, the investigators will use sophisticated carefully calibrated mathematical modelling techniques to estimate the impact of the intervention and each component on HIV transmission amongst FSWs, their clients and the general population, following modelling and impact assessment approaches previously developed for Cotonou and for the evaluation of Avahan, the India AIDS Initiative of the Bill & Melinda Gates Foundation.