Human immunodeficiency virus (HIV) causes acquired immunodeficiency syndrome (AIDS). The HIV virus attacks immune system, our body’s natural defense against any illness. This virus attacks a type of white blood cell called CD4 cells in the immune system. Also known as T-helper cells, these special cells assist the immune system to fight infections. HIV destroys CD4 cells and multiplies inside these cells. If left untreated, HIV damages the immune system so severely that it becomes difficult for the system to fight off other infections and diseases.

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