AIDS (acquired immunodeficiency syndrome) was first reported in the United States in 1981 and has since become a major worldwide epidemic. AIDS is caused by HIV (human immunodeficiency virus). By killing or damaging cells of the body's immune system, HIV progressively destroys the body's ability to fight infections and certain cancers. People diagnosed with AIDS may get life-threatening diseases called opportunistic infections, which are caused by microbes such as viruses or bacteria that usually do not make healthy people sick. More than 900,000 cases of AIDS have been reported in the United States since 1981. As many as 950,000 Americans may be infected with HIV, one-quarter of whom are unaware of their infection. The epidemic is growing most rapidly among minority populations and is a leading killer of African-American males ages 25 to 44. According to the Centers for Disease Control and Prevention (CDC), AIDS affects nearly seven times more African Americans and three times more Hispanics than whites. In recent years, an increasing number of African-American women and children are being affected by HIV/AIDS. In 2003, two-thirds of U.S. AIDS cases in both women and children were among African-Americans.
HIV is present in the blood and genital secretions of virtually all individuals infected with HIV, regardless of whether or not they have symptoms. The spread of HIV can occur when these secretions come in contact with tissues such as those lining the vagina, anal area, mouth, or eyes (the mucus membranes), or with a break in the skin, such as from a cut or puncture by a needle. The most common ways in which HIV is spreading throughout the world include sexual contact, sharing needles, and by transmission from infected mothers to their newborns during pregnancy, labor (the delivery process), or breast-feeding. (See the section below on treatment during pregnancy for a discussion on reducing the risk of transmission to the newborn.)
The risk of HIV transmission occurring after any potential exposure to bodily fluids is poorly defined. The highest risk sexual activity, however, is thought to be anal intercourse without a condom. In this case, the risk of infection may be as high as 3% to 5% for each exposure. The risk is probably less for vaginal intercourse without a condom and even less for oral sex without a latex barrier. Despite the fact that no single sexual exposure carries a high risk of contagion, HIV infection can occur after even one sexual event. Thus, people must always be diligent in protecting themselves from potential infection.
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The Body: The Complete HIV/AIDS Resource
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AIDS Education Global Information System (AEGIS)
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HIV & AIDS statistics from around the world
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AVERT - A UK HIV and AIDS Charity
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National Association On HIV Over Fifty
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HIV and AIDS Causes, Symptoms, Treatment, Prevention Facts and ...
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AIDS / HIV - Health
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AIDS and HIV Infection - Symptoms, Treatment and Prevention
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HIV and AIDS - Health Canada
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HIV/AIDS
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