In the first section of the article, the authors consider the epidemiological data available in Switzerland mid-june 1988, concerning persons between 15 to 24, either already suffering from AIDS or HIV-positive. These data are compared with those from Europe and the United States. In a second section, the authors analyse the attitude and behaviors of young people with respect to sexuality in general and to AIDS. In a third section, they survey different AIDS prevention programs and methods, namely campaigns through schools, the mass media and youth associations. The role of health and medical profession is also considered. Alternative strategies are presented: travelling exhibitions, mobile disco, street work, adoption of adolescent go-betweens etc. The article concludes that prevention should extend beyond the information: youth discussion dialogue and participation is essential.