Sexually transmitted disease (STD) is increasing in the United States. Most STDs are treatable, but there is no cure at present for the human immunodeficiency virus (HIV), the cause of acquired immunodeficiency syndrome (AIDS). AIDS leads to a fatal outcome in most cases.
Although HIV can be spread through use of contaminated needles or, rarely, through blood transfusion, it usually is transmitted by sexual contact. The virus is present in semen and vaginal secretions and enters a person's body
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