In the Vertical Transmission of HIV, Timing May Be Everything

Abstract
Since virtually all the human immunodeficiency virus (HIV) infections that now occur in children are a consequence of vertical transmission (that is, from mother to child), interruption of this mode of passage would change the future of the acquired immunodeficiency syndrome (AIDS) in children. Of the 19,652 cases of AIDS in women reported to the Centers for Disease Control through June 1991, 78 percent involved women of childbearing age.1 Although the current seroprevalence of HIV infection is 0.15 percent among women of childbearing age in the United States, in parts of Central Africa and Haiti 5 to 30 percent of . . .