The immune system recognizes HIV by its antigen shape. But, just
when the immune system recognizes one shape, HIV may multiply
and change the shape of its antigen. HIV can "hide" from the
immune system for a long time. When HIV infects a cell the virus
may make more viruses and infect more cells or lie quietly in a
cell for a long time. If HIV doesn't reproduce, the immune
system can't find it and destroy it. HIV destroys the immune
system. The Immune system consists of Innate Immunity and
Humoral Immunity Innate Immunity is Non-specific Immunity,
whereas Humoral Immunity is specific Immunity. T-cells produce
Cell-Mediated Immunity and B-cells produces Humoral Mediated
Immunity. As HIV destroys more and more helper T cells, the
immune system begins to break down. Finally the immune system
can no longer kill HIV or any other invading germs and a person
infected with HIV is diagnosed with AIDS.