👉 The term "sexually transmitted infection" (STI) refers to an organism that can be transmitted through sexual contact. The most common STIs are chlamydia, gonorrhea, and syphilis. Chlamydia is a bacterium that can cause symptoms like pain in the abdomen, fever, cough, and difficulty breathing. Gonorrhea is another bacterium that causes inflammation of the reproductive organs, such as the cervix or prostate gland. Syphilis is a