It is estimated that approximately 10,000 children are living with HIV infection in the United States. In the United States, the number of infants born with HIV infection has dramatically decreased from about 2,000 a year to fewer than 200 a year due to identification of HIV infection in pregnant women and use of anti-HIV drugs during pregnancy, cesarean delivery, and avoidance of breastfeeding.
In contrast to the United States, mother-to-child transmission in developing countries remains a major problem; about 700,000 infants are newly infected with HIV each year because most women are not screened for HIV during pregnancy, anti-HIV drugs are not available, and safe alternatives to breastfeeding are not available.
Prior to 1985, when screening of the nation's blood supply for HIV began, some children as well as adults were infected through transfusions with blood or blood products contaminated with HIV, but this is now rare in the United States.
In contrast to the dramatic decrease in mother-to-child transmission of HIV infection, the number of cases of HIV infection in adolescents and young adults continues to increase in the United States. About one-third to one-half of new HIV infections in the United States are among adolescents and young adults.
Most HIV-infected adolescents and young adults are exposed to the virus through unprotected sex; some teens and young adults are also infected through injection drug use. In addition, an increasing number of children who were infected as infants are now surviving to adolescence.