why AIDS attack on immune system? and what do mean by a syndrome?

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Solution

Human immunodeficiency virus (HIV) is a retrovirus which infects human beings causing AIDS. AIDS is a disease in which the immune system of the individual gets affected and immunity is reduced. Lymphocytes present in the blood are destroyed by HIV. HIV attacks the immune system by attaching itself to a T cell.The more T cells are destroyed the weaker is the immune system.

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