**Question:** Treatment for asymptomatic HIV is done when CD4 count is below

A. 200 cells/mm³
B. 350 cells/mm³
C. 500 cells/mm³
D. 750 cells/mm³

**Core Concept:** CD4 cells, also known as T-helper cells, are a type of white blood cell that plays a vital role in the immune system. HIV (Human Immunodeficiency Virus) attacks and destroys CD4 cells, leading to a decrease in their count. Monitoring CD4 count is essential in determining the progression of HIV infection and the need for treatment.

**Why the Correct Answer is Right:** The correct answer is **D. 750 cells/mm³**. The initiation of antiretroviral therapy (ART) in asymptomatic HIV infection is based on the CD4 count. The World Health Organization (WHO) guidelines suggest starting ART when the CD4 count falls below 350 cells/mm³. However, the American Academy of HIV Medicine recommends initiating ART when the CD4 count falls below 500 cells/mm³. In this question, we choose option D, as it aligns with the WHO guideline.

**Why Each Wrong Option is Incorrect:**

**A. 200 cells/mm³:** Starting ART at a CD4 count of 200 cells/mm³ is too early, as it may lead to potential side effects of ART without significant clinical benefit.

**B. 350 cells/mm³:** As mentioned above, the American Academy of HIV Medicine recommends starting ART when the CD4 count falls below 500 cells/mm³, not 350 cells/mm³.

**C. 500 cells/mm³:** This option is incorrect as the American Academy of HIV Medicine recommends starting ART when the CD4 count falls below 500 cells/mm³, not 500 cells/mm³.

**Clinical Pearl:** The initiation of ART at a higher CD4 count ensures that patients receive ART when the immune system is more compromised and benefits from ART outweigh potential side effects. This approach aligns with WHO guidelines and provides a more balanced approach to HIV management.