Sexually transmitted infections (STIs) are infections that are spread by sexual contact. Sexually transmitted infections can cause severe damage to your body—even death. Except for colds and flu, STIs are the most common contagious infections in the United States, with millions of new cases each year. Although some STIs can be treated and cured, others cannot.
A person with an STI can pass it to others by contact with skin, genitals, mouth, rectum or body fluids. Anyone who has sexual contact — vaginal, anal or oral sex — with another person may get an STI. STIs may not cause symptoms. Even if there are no symptoms, your health can be affected.
Having an STI during pregnancy can harm the baby. Please let your provider know if you are pregnant and you or your partner have had—or may have—an STI. Your baby may be at risk. Tests for some STIs are offered routinely during prenatal care. It is best to treat the STI early to decrease the chances that your baby also will contract the infection.