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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.
People with AIDS usually have regular blood tests to check their CD4 cell count: 1  CD4 cells are a type of T cell. 2  A lower than normal CD4 cell count may be a sign that the virus is damaging the immune system. 3  When the CD4 count gets too low, the risk of infections and some types of cancer increase.