Sexually transmitted infections (STIs) are infections caused by pathogens spread through sexual contact. STIs can progress from an infection into a sexually transmitted disease (STD). Chlamydia, gonorrhea, syphilis and HIV are the most commonly screened for STIs in the US. The CDC STD Surveillance Data estimates that there were more than 2.5 million cases of chlamydia, gonorrhea, and syphilis...