Abstract
Objective: To verify the knowledge and opinion of basic education students about sexually transmitted infections in a state school located in a municipality in the state of Pará. Methods: A descriptive, quantitative cross-sectional study with 300 high school students, carried out at a public school in Barcarena / PA, from September to October 2018. Results: The average age of the respondents was 17 years and 69% students were female. Of the interviewees, 186 (62%) students reported having started their sex life. About the knowledge about diseases that can be transmitted during unprotected sexual intercourse 252 (82.0%) students answered that infectious contagious diseases are transmitted without the use of condoms. Conclusion: It is observed in this reflection that the situations of vulnerability of adolescents to STI arerelated to the lack of understanding of the use of condoms, low educational level, poor knowledge and information, cultural factors and lack of guidelines.