HIV-infected mothers have about 20 ml of blood drawn to test for infectious diseases (e.g., hepatitis). At time of delivery maternal HIV viral load is measured. After delivery, about 60 ml of blood is collected from the umbilical cord; this blood is labeled and transferred to the umbilical cord blood bank for possible use in future gene therapy studies on the infant. At birth, infant HIV status and general health are assessed. If the infant is found to be HIV-infected, the mother may be approached about the infant's participation in a future gene therapy study. If the infant is not HIV-infected, the cord blood is stored for up to four years and is then released to the mother, or, with her consent, to the research community.