RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Spong, Catherine Y. A1 Casey, Brian M. SR Print(0) ID 1190770654 T1 Sexually Transmitted Infections T2 Williams Obstetrics, 26e YR 2022 FD 2022 PB McGraw Hill PP New York, NY SN 9781260462739 LK accessmedicine.mhmedical.com/content.aspx?aid=1190770654 RD 2024/11/03 AB Sexually transmitted infections (STIs) include syphilis, gonorrhea, chlamydial and trichomonal infections, and infections caused by human immunodeficiency virus (HIV), herpes simplex virus (HSV), human papillomavirus (HPV), and hepatitis B and C viruses. In describing their pathogenesis, horizontal transmission is transfer to a contemporary. Instead, vertical transmission refers to passage of an infectious agent from the mother to her fetus through the placenta, during labor or delivery, or by breastfeeding. Many STIs can harm the mother or fetus. Thus, these are sought through both asymptomatic screening and symptomatic diagnostic testing and then treated. For this, the Centers for Disease Control and Prevention (CDC) provides guidelines, which are described throughout this chapter.