Interventional HIV prevention strategy based on pre-exposure prophylaxis (PrEP) with Truvada® for people in the Île-de-France area (or Paris region) who don't have HIV but who are at high risk of becoming infected with HIV (men who have sex with men (MSM), transgender men and women, heterosexual men and women, sex workers, migrants) in combination with overall prevention services (communautary-based or educational counselling; addiction, social and psychological care; condoms and lubricating gel; clean injection equipment; sexually transmitted diseases (STD) screening and treatment; hepatitis A virus (HAV), hepatitis B virus (HBV) and hepatitis C virus (HCV) vaccinations and post-exposure treatment of HIV infection as soon as possible after diagnosis using an antiretroviral combination recommended by the French Guidelines on HIV treatment).