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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.
The Human Immunodeficiency Virus (HIV) seems to only infect the CD4 (or T-helper) cells of the immune system.The CD4 cells are responsible for activating and directing other â¦ immune system cells.  HIV also infects macrophages and microglial cells that express the CD4 molecule on their surface.The virus can also infect a subtype of myeloid dendritic cells MDC-1. 12 people found this useful.he Human Immunodeficiency Virus (HIV) seems to only infect the CD4 (or T-helper) cells of the immune system.