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An acquired disease is one which is not inherited It is caught by itself There fore a person with an acquired disease has either been infected with the disease by not eating properly sexual habits or their occupation 1Infectious AIDS is the final life-threatening stage of infection with human immunodeficiency virus HIV AIDS stands for acquired immune deficiency syndrome The name refers to the fact that HIV severely damages the immune system the bodys most important defence against disease Cases of AIDS were first identified in 1981 in the United States but researchers have detected HIV in a specimen collected in 1959 in central Africa Millions of AIDS cases have been diagnosed worldwide Cause Two viruses that belong to a group called retroviruses cause aids Researchers in France isolated the first AIDS virus in 1983 and in the United States in 1984 The virus became known as HIV-1 In 1985 scientists in France identified another closely related virus that also produces AIDS This virus named HIV-2 occurs mainly in Africa HIV-1 occurs throughout the world HIV infects certain white blood cells including T-helper cells and macrophages that play key roles in the immune system Parts of the immune system The virus attaches to CD4 receptor molecules on the surface of these cells which are often called CD4 cells HIV enters CD4 cells and inserts its own genes into the cells reproductive system The cell then produces more HIV which spreads to other CD4 cells Eventually infected cells die Symptoms People infected with HIV eventually develop symptoms that may be caused by other less serious conditions With HIV infection however these symptoms are prolonged and often more severe They include enlarged lymph glands tiredness fever loss of appetite and weight diarrhoea yeast infections of the mouth and vagina and night sweats HIV commonly causes a severe wasting syndrome resulting in substantial weight loss a general decline
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