HIV (human immunodeficiency   virus) is the virus that causes AIDS. This virus may be passed from one person   to   another when infected blood, semen, or vaginal   secretions come in contact with an uninfected person’s broken skin or   mucous membranes*. In addition, infected pregnant women can pass HIV to their   baby during pregnancy or delivery, as well as through breast-feeding. People   with HIV have what is called HIV infection. Some of these people will develop   AIDS as a result of their HIV infection.
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