Your sexual health is important and staying safe from Sexually Transmitted Infections (STIs) is about knowing the facts. In Boston, 3 infections make up the majority of the STIs in the community. These are Chlamydia, Gonorrhea, and Syphilis. To keep you better educated and protected against these common STIs read, download and print the PDF fact sheets below. These fact sheets include information about the signs and symptoms of STIs, when to get tested, and how to prevent these infections. Remember, staying educated is the best way to protect yourself!