[High school students and their knowledge about HIV/AIDS: what has changed in ten years?].

An exploratory, descriptive, comparative study with a quantitative approach, whose objective was to compare the knowledge of high school students from two public state schools of Peruíbe, SP, Brazil, about Human Immunodeficiency Virus (HIV) and Acquired Immunodeficiency Syndrome (AIDS), in the years 1999 and 2010. In both of these years, the predominant population studied was female students, under 18 years old, unmarried and white. A statistically significant difference was found with respect to knowledge about HIV/AIDS among the groups studied.