TasP makes sense as a public health intervention as long as high levels of coverage are achieved in the high-frequency transmitter population targeted by this intervention. Hence, the TasP component of the project will benefit from the ongoing CIHR/NACP interventions aimed at increasing HIV testing among FSWs. Indeed, within this context, the investigators are currently carrying out a study on the determinants of regular HIV testing, based on the Theory of planned behaviour. The results of this study will be used to develop an education program promoting 3-monthly HIV testing among FSWs that will be ready to implement prior to the beginning of recruitment in the proposed study. The development of this program will use the intervention mapping approach. Its implementation is already planned in all the coverage area of our ongoing CIHR project. The latter project will also contribute by defining precise indicators of success specifically for professional FSWs (e.g. those whose main source of income is sex work who will constitute our target population), based on accurate estimations of their population size. Indeed, the investigators are currently conducting a detailed scientific mapping of the FSW population in the cities and towns covered by our ongoing intervention. The results of this size estimation study will be available before the end of 2013 and will be used to establish the denominators for the testing and TasP coverage indicators.