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AIDS is the late stage of HIV infection that occurs when the body's immune system is badly damaged because of the virus. HIV destroys helper T cells AIDS (acquired immune deficiency syndrome) is the name used to describe a number of potentially life-threatening infections and illnesses that happen when your immune system has been severely damaged by the HIV virus. While AIDS cannot be transmitted from 1 person to another, the HIV virus can.

The major cell infected by HIV is the helper T-lymphocyte, which is major component of immune system. As the HIV infection continues in the host, the decrease of helper T-lymphocytes results in failure of the immuhe system and the infected person becomes susceptible to diseases such as AIDS. 

When HIV is introduced into the body, this virus is too strong for the helper T cells and killer T cells. The virus then invades these cells and reproduce to it's maximum capacity thereby causing AIDS.

As the T cells become progressively destroyed or inactivated, other viruses, parasites or cancer cells (called "opportunistic diseases") which would not have been able to get past a healthy body's defense, can multiply within the body cells without the fear of destruction.

AIDS is the late stage of HIV infection that occurs when the body's immune system is badly damaged because of the virus.HIV destroys helper T cells. AIDS (Acquired Immunodeficiency Syndrome) is the name used to describe a number of potentially life-threatening infections and illnesses that happen when your immune system has been severely damaged by the HIV virus. While AIDS cannot be transmitted from one person to another, the HIV virus can.