Most HIV (human immunodeficiency virus) infections in infants are caused by transmission from the mother. The virus spreads from the mother to the baby while in the womb, from exposure during delivery, or through breast-feeding.
For information about other infections screened early in pregnancy, go to Toxoplasmosis in Pregnancy, Screening for Rubella, Screening for Parvovirus in Pregnancy, CMV in Pregnancy, Screening for Varicella-Zoster in Pregnancy, Syphilis in Pregnancy, Listeria in Pregnancy, andHepatitis in Pregnancy.