👉 Syphilis is a sexually transmitted infection (STI) that affects the reproductive organs and can be caused by the bacteria, Chlamydia trachomatis. It's also known as gonorrhea, which is an STI caused by another type of bacteria, Gonorrhea. The symptoms of syphilis can include painful sores on the skin or in the mouth (which are called ulcers) and sometimes a fever. If left untreated, syphilis can lead to
