... an increase in cases of sexually transmitted diseases, including AIDS. HIV may have been introduced into industrialized nations several times before transmission was sustained and became widespread. AIDS was first identified as a "new" disease by physicians in Los Angeles and New York City in 1980 and 1981. The doctors recognized the condition as something new because all the patients were previously healthy, young homosexual men suffering from ... homosexual men. Cause AIDS is caused by the human immunodeficiency virus HIV. By killing or impairing cells of the immune system, HIV progre...

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