A 32-year-old man with newly diagnosed HIV-1 infection (CD4 count 450 cells/μL, viral load 85,000 copies/mL) presents to the antiretroviral clinic. He is asymptomatic, has no opportunistic infections, and baseline resistance testing shows no mutations. He asks when to start antiretroviral therapy (ART). What is the next step in management?

Explanation

## Timing of Antiretroviral Therapy Initiation **Key Point:** Current WHO and Indian national guidelines recommend immediate ART initiation for all individuals with HIV-1 infection, regardless of CD4 count or clinical stage (test-and-treat strategy). ### Rationale for Immediate ART 1. **Virological suppression** — Early ART reduces viral load, halting immune destruction and preventing disease progression. 2. **Prevention of transmission** — Undetectable viral load (< 50 copies/mL) means untransmittable (U=U); critical for partner protection and public health. 3. **Immune reconstitution** — Even with CD4 > 200 cells/μL, early therapy preserves immune function and reduces long-term morbidity. 4. **Mortality reduction** — Meta-analyses show immediate ART reduces all-cause mortality compared to deferred initiation. ### CD4 Count Context | CD4 Count (cells/μL) | Clinical Significance | ART Timing | |---|---|---| | > 500 | Preserved immunity | Immediate (test-and-treat) | | 200–500 | Moderate immunosuppression | Immediate | | < 200 | Severe immunosuppression; OI risk | Immediate + OI prophylaxis | | < 50 | Critical; MAC/CMV risk | Urgent initiation | **High-Yield:** This patient's CD4 of 450 cells/μL does NOT warrant deferral. The "CD4 threshold" era (waiting for CD4 < 200) is obsolete. ### First-Line Regimen Selection For a treatment-naïve patient with no resistance mutations: - **Preferred:** Integrase inhibitor (e.g., dolutegravir) + 2 NRTIs (e.g., tenofovir/lamivudine) - **Alternative:** PI-based or NNRTI-based regimens (if integrase inhibitor contraindicated) **Clinical Pearl:** Baseline resistance testing is already done (mentioned in stem); no need to wait for repeat results before initiating therapy. ### Why Prophylaxis Is Not Indicated Here PCP prophylaxis is recommended only when CD4 < 200 cells/μL. This patient's count is 450, so prophylaxis is not indicated at present.