what causes syphilis

Syphilis is an infection caused by the bacterium Treponema pallidum. It is most often spread through sexual contact, including vaginal, oral, or anal sex. The disease starts as a painless sore that typically appears on the genitals, rectum, or mouth. Syphilis can also be passed from a mother to her baby during pregnancy and childbirth, and sometimes through breastfeeding. Without treatment, syphilis can damage the heart, brain, or other organs, and it can be life-threatening. The infection can stay in the body for many years without causing symptoms, but it can become active again. Early syphilis can be cured, sometimes with a single shot of penicillin