A 6-month-old infant born to an HIV-positive mother on antiretroviral therapy (CD4 count >200 cells/μL) presents to the immunisation clinic. The child is clinically well and has received BCG, OPV-0, and hepatitis B birth dose. According to the National Immunisation Schedule (NIS), what is the most appropriate next step in management regarding further immunisations?

Explanation

## Management of Immunisation in HIV-Exposed Infants ### Clinical Context This infant is HIV-exposed (mother on ART with adequate CD4 count) but status unknown. The NIS provides specific guidance for such children. ### Key Point: **HIV-exposed infants born to mothers on effective ART with CD4 >200 cells/μL should receive routine immunisations according to the standard NIS schedule, with one critical modification: OPV is replaced with IPV.** ### Rationale for IPV Substitution 1. OPV is a live attenuated vaccine — carries theoretical risk of vaccine-strain poliomyelitis in immunocompromised hosts 2. IPV is inactivated and safe in all immunological states 3. Both provide adequate polio protection; IPV is preferred in HIV-exposed/infected children ### National Immunisation Schedule Modification for HIV-Exposed Children | Vaccine | Standard Schedule | HIV-Exposed (Mother on ART, CD4 >200) | HIV-Infected (CD4 >200) | | --- | --- | --- | --- | | BCG | Birth | Birth (if exposed only) | Defer until CD4 >200 | | OPV | Birth + schedule | **Replace with IPV** | **Replace with IPV** | | DPT | 6, 10, 14 weeks | 6, 10, 14 weeks | 6, 10, 14 weeks | | Rotavirus | 6, 10, 14 weeks | 6, 10, 14 weeks | Defer until CD4 >200 | | Measles | 9 months | 9 months (if CD4 >200) | Defer until CD4 >200 | | Hepatitis B | Birth + schedule | Birth + schedule | Birth + schedule | ### High-Yield: **The single most important modification in the NIS for HIV-exposed infants is OPV → IPV substitution. All other inactivated vaccines proceed on schedule.** ### Clinical Pearl: Maternal CD4 >200 cells/μL on ART indicates low risk of vertical transmission and adequate maternal immune function; the infant can safely receive most routine vaccines without waiting for CD4 confirmation, provided IPV is used instead of OPV. ### Next Steps 1. Administer IPV at 6 weeks (instead of OPV-1) 2. Continue DPT, hepatitis B, and other inactivated vaccines on schedule 3. Confirm child's HIV status by 18 months (virological testing) 4. Reassess live vaccines (rotavirus, measles) once HIV status is known and CD4 is adequate [cite:IAP Guidelines on Immunisation of HIV-Infected Children, Park 26e Ch 6]