## Correct Answer Analysis **Key Point:** The question tests knowledge of the current UIP schedule and vaccine characteristics in India. ### Why Option 3 is INCORRECT Measles vaccine requires **two doses** for optimal protection: - **First dose:** 9 months of age - **Second dose:** 16-24 months of age (as part of MR/MMR vaccine) A single dose at 9 months leaves approximately 5–10% of vaccinees unprotected. The two-dose schedule achieves >99% seroconversion and is the standard recommendation in the current UIP. ### Correct Statements (Options 1, 2, 4) | Vaccine | Schedule/Details | Status | |---------|------------------|--------| | **BCG** | Intradermal at birth; 0.05 mL | ✓ Correct | | **OPV** | 6, 10, 14 weeks + booster at 18 months | ✓ Correct | | **DPT** | 6, 10, 14 weeks (primary); boosters at 18 months & 5 years | ✓ Correct | **High-Yield:** The two-dose measles schedule is a frequent NEET PG trap — examiners test whether candidates know that one dose is insufficient for herd immunity and disease elimination goals. **Clinical Pearl:** India's push toward measles elimination (WHO target) mandates the second dose; single-dose coverage alone cannot achieve the >95% population immunity threshold needed for outbreak prevention. [cite:Park 26e Ch 7]
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