A person is diagnosed with AIDS, or acquired immunodeficiency syndrome, according to the U.S. Centers for Disease Control and Prevention (CDC), when they have tested positive for HIV and have one or both of the following conditions:
A CD4 cell count (or T-cell count) of below 200 per cubic millimeter of blood
One or more AIDS-related illnesses. These illnesses are sometimes referred to as opportunistic infections since they develop due to the weakened immune system
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