In this section we explain the mechanics behind how HIV affects your immune system. We explain the way in which your white blood cells that HIV targets are measured and used to gauge how much damage HIV has done to your immune system. We also explain the way in which the amount of HIV in your blood is measured.

In the Stages of HIV Infection you can get more information on the four distinct stages of HIV infection from the point at which infection occurs right up to when an AIDS diagnosis would be given.