Which of the following CD^+ T-cell counts and viral loads are associated with increased risk of

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Which of the following CD^+ T-cell counts and viral loads...

Which of the following $\mathrm{CD}^{+} \mathrm{T}$-cell counts and viral loads are associated with increased risk of progression to an AIDS-defining illness? (A) CD4 ${ }^{+}$T-cell count of $100 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 500 . (B) $\mathrm{CD}^{+} \mathrm{T}-\mathrm{cell}$ count of $1000 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 5000 . (C) $\mathrm{CD} 4^{+} \mathrm{T}-c e l l$ count of $1000 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 500,000. (D) CD4 $4^{+}$-cell count of $100 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 50,000.

Which of the following $\mathrm{CD}^{+} \mathrm{T}$-cell counts and viral loads are associated with increased risk of progression to an AIDS-defining illness?
(A) CD4 ${ }^{+}$T-cell count of $100 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 500 .
(B) $\mathrm{CD}^{+} \mathrm{T}-\mathrm{cell}$ count of $1000 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 5000 .
(C) $\mathrm{CD} 4^{+} \mathrm{T}-c e l l$ count of $1000 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 500,000.
(D) CD4 $4^{+}$-cell count of $100 \mathrm{cells} / \mu \mathrm{L}$ and a viral load of 50,000.

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Key Concepts

Viral Load

Viral load refers to the amount of HIV viral RNA present in the blood and is used to assess the severity and activity of HIV infection. A higher viral load indicates active viral replication and is associated with a faster decline in CD4+ T-cell count, leading to an increased risk of disease progression to AIDS.

CD4+ T-cell Count

CD4+ T-cell count is a measure of the number of helper T lymphocytes in the bloodstream and is a critical indicator of immune system health. In the context of HIV infection, lower CD4 counts (especially below 200 cells/?L) signify significant immunosuppression, making individuals more vulnerable to opportunistic infections and illnesses that define the progression to AIDS.

AIDS-defining Illness

An AIDS-defining illness is an opportunistic infection or cancer that occurs in the setting of advanced HIV infection, typically when the immune system is severely compromised. The risk of developing these illnesses increases when the CD4+ T-cell count is low and/or the viral load is high, highlighting the importance of monitoring these parameters in HIV-infected individuals.

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