The AIDS phase of HIV infection begins when the concentration of CD4 T cells in the blood drops below what concentration?
A) 2,000 cells per cubic millimeter
B) 1,000 cells per cubic millimeter
C) 500 cells per cubic millimeter
D) 200 cells per cubic millimeter
E) No CD4 T cells are observed.

Question

Quizplus · Accepted Answer

The AIDS phase of HIV infection begins when the concentration of CD4 T cells in the blood drops below 200 cells per cubic millimeter. At this point, the immune system becomes severely compromised, making individuals much more susceptible to opportunistic infections and cancers that can be life-threatening. HIV medications can help prevent the depletion of CD4 T cells, prolonging the time until AIDS develops.

The AIDS Phase of HIV Infection Begins When the Concentration