A survey was carried out on students of Secondary School, "Obstetrics" and "Nurses", University, in order to evaluate their knowledge level about AIDS. Generally the inquired sample showed, in a satisfactory ratio, a good knowledge about AIDS topic; nevertheless, a certain confusion appeared about infection and illness meaning and the 23.0% of interviewed students believes that AIDS is not always lethal. Furthermore, blood-donation and insect bites are believed to be potential factors of transmission. Television was found as the most frequent source of information. From our data we suggest that a major role in educational sanitary programs should be played by a closer teacher-student relation