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Finally, with further decreases in the levels of CD4 cells, the person develops AIDS. According to the CDC, for an HIV-infected person, some signs that AIDS has developed (known as AIDS-defining conditions) are: The CD4 cell count has decreased to fewer than 200 cells per cubic milliliter of blood.
HIV INFECTION begins with a sharp rise of virus in the blood (orange line) and a consequent drop in CD4 T cells (blue line). The immune system soon recovers somewhat, however, and keeps HIV levels fairly steady for several years. Eventually, though, the virus gains the upper hand. AIDS is diagnosed when the CD4 T cell level drops below 200 cells per cubic millimeter of blood or when opportunistic infections arise.