A 3-month-old male infant born to an HIV-positive mother on antiretroviral therapy (CD4 count 450 cells/μL) presents for routine immunisation. The mother is on HAART for 2 years with undetectable viral load. According to IAP guidelines, which of the following immunisation schedules is most appropriate for this child?

Explanation

## IAP Guidelines for HIV-Exposed Infants (Mother on HAART with Undetectable Viral Load) **Key Point:** For an HIV-exposed infant whose mother has an **undetectable viral load** on HAART, the risk of vertical transmission is <1–2%. IAP 2023 guidelines recommend giving **all vaccines including live vaccines as per the normal IAP schedule** in this scenario, since the infant is presumed HIV-uninfected. ### Maternal Status Assessment - Mother on HAART for 2 years, CD4 count 450 cells/μL, **undetectable viral load** - Vertical transmission risk is extremely low (<2%) with sustained viral suppression - The infant at 3 months is presumed **HIV-exposed but uninfected (HEU)** ### IAP Recommendations for HIV-Exposed Uninfected (HEU) Infants | Parameter | Action | |-----------|--------| | **Inactivated vaccines** | Give as per normal IAP schedule | | **Live vaccines (OPV, MMR, varicella, rotavirus)** | **Give as per normal IAP schedule** — no deferral required for HEU infants | | **Rationale** | Maternal undetectable viral load = infant presumed uninfected; live vaccines are safe | **High-Yield:** The restriction on live vaccines (deferral until CD4 >500 cells/μL) applies to **HIV-positive children**, NOT to HIV-exposed uninfected infants. When the mother has an undetectable viral load on HAART, the infant follows the **standard immunisation schedule** without modification. ### Why Other Options Are Incorrect - **Option A:** Deferring all live vaccines until CD4 >200 cells/μL is the threshold for OI prophylaxis in HIV-positive individuals — not the immunisation threshold, and not applicable to HEU infants. - **Option C:** Restricting to only DPT, polio, and hepatitis B is overly conservative and not supported by IAP 2023 guidelines for HEU infants. - **Option D:** The CD4 >500 threshold and HAART >3 months criterion apply to **confirmed HIV-positive children**, not to HEU infants with a mother on effective HAART. ### Clinical Pearl - If the infant is **confirmed HIV-positive**, live vaccines are deferred until CD4 >500 cells/μL (or CD4% >25%) - If the infant is **HIV-exposed but uninfected** (mother with undetectable viral load on HAART), the **full normal IAP schedule** including live vaccines is recommended - OPV, rotavirus, MMR, and varicella can all be given on schedule in HEU infants **Mnemonic: HEU = Normal Schedule** — HIV-Exposed Uninfected infants with virally suppressed mothers follow the standard IAP immunisation schedule. [cite: IAP Immunisation Recommendations 2023; WHO guidelines on immunisation of HIV-exposed infants]