March 10 is National Women and Girls HIV/AIDS Awareness Day. In 2005, women accounted for 26% of newly diagnosed acquired immunodeficiency syndrome (AIDS) cases, compared with 11% in 1990. Of an estimated 9,708 women and adolescent girls who had human immunodeficiency virus (HIV)/AIDS diagnosed during 2005, the majority (80%) had become infected through high-risk heterosexual contact, and 19% had become infected through injection-drug use.