Immune System
The immune system is a system of biological structures and processes within an organism that protects against disease.The important lymphoid organs of the immune system are the thymus and bone marrow, and secondary lymphatic, tissues such as the spleen,tonsils, lymph vessels,  

Aids is a disease that affects the immune system. Aids is a disease in which there is a severe loss of the body's cellular immunity, greatly lowering the resistance to infection and malignancy. There's no cure for HIV, but there are medications that can dramatically slow disease progression.These drugs have reduce Aids deathes in many developed nations.

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