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Diseases are caused by the presence of bacteria or viruses in the body. The symptoms may be due to the antigen or foreign proteins of the bacteria or the toxic chemicals produced by the bacteria. Recovery from the disease followed by immunity depends mainly on the production of antibodies in the blood. Antibodies are proteins released into the blood which destroy kills or rids the body of these disease causing microorganisms different ways..

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The HIV virus, which stands for Human Immunodeficiency virus, was first discovered in 1985. This virus is responsible for the cause of AIDS (Acquired Immunodeficiency Syndrome), discovered in 1959.

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Containing many secrets hitherto undiscovered, the most striking pieces of evidence that human encountered has the greatest impasse for the mystery of life.