AIDS is the short form for 'Acquired Immunodeficiency Syndrome', which means having a defective immune system. AIDS is caused by the human immunodeficiency virus(HIV) which is transmitted during blood transfusion or sexual intercourse. Inside the body, the virus attaches iteself to specific white blood cells, which are important fot the body's immune system. Subsequently, the virus penetrates these cells, destroys them, and prodces new HIV viruses, If uncontrolled, the virus slowly destroys the entire immune system of the body. Even minor illnesses like the common cold can assume serious proportions, There are medicines that can slow down the onset of AIDS, but none to completely cure it.
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