A 15-month-old girl is brought to the primary health centre by her father. She has received all vaccines on schedule up to 12 months (BCG, OPV-3, IPV-2, DPT-3, Hepatitis B-3, PCV-3, Rotavirus-3, and Measles-1 at 9–12 months). The father asks what vaccines are still pending. According to the National Immunisation Schedule and IAP guidelines, which vaccine(s) should be administered now?

Explanation

## Immunisation Status at 15 Months (NIS 2023 + IAP Guidelines) **Key Point:** At 15 months, a child who has completed the primary series is approaching the 16–24 month booster window. According to both the National Immunisation Schedule (NIS 2023) and IAP guidelines, the vaccines due at **16–24 months (typically 18 months)** are **Measles-2 (MR/MMR)** and **DPT Booster-1** (along with OPV/IPV booster). At 15 months, the child is within the acceptable early window for these boosters. ### Vaccines Due at 16–24 Months (NIS 2023) | Vaccine | Age | Dose | Notes | |---------|-----|------|-------| | Measles-2 (MR/MMR) | 16–24 months (18 months) | 2nd dose | Given as MR in NIS; MMR in IAP | | DPT Booster-1 | 16–24 months (18 months) | 1st booster | Diphtheria, Pertussis, Tetanus | | OPV/IPV Booster | 16–24 months (18 months) | Booster | Given alongside DPT booster | **High-Yield:** The classic **"18-month triad"** in NIS is: **MR (Measles-Rubella), DPT Booster-1, and OPV Booster**. However, the question asks which vaccines are "still pending" for a 15-month-old who has received Measles-1 at 9–12 months. The most clinically relevant pending vaccines are **Measles-2 (MR/MMR) and DPT Booster-1**, as these are the primary outstanding immunological gaps. **Why Option B is Correct:** - Measles-2 (MR/MMR) is due at 16–24 months — the child has only received Measles-1 and needs the second dose. - DPT Booster-1 is due at 16–24 months — the child completed the primary DPT series (3 doses) and now needs the first booster. - Both are part of the NIS 2023 schedule and IAP guidelines for this age window. **Why Option C is Incorrect:** - While OPV/IPV booster is also due at 16–24 months, the question specifically pairs it with "DPT booster-1" without mentioning MR/Measles-2. The more complete and clinically important answer includes Measles-2 (MR/MMR), which represents a significant pending immunological gap (second dose of measles vaccine not yet given). - Option B captures the two most high-yield pending vaccines: the MR second dose and DPT booster. **Why Other Options Are Incorrect:** - **Option A (Varicella and Hepatitis A):** These are IAP optional vaccines, not part of the core NIS schedule. They are not "pending" in the NIS context. - **Option D (JE and TCV):** JE is region/endemic-zone specific; TCV is not part of NIS (IAP recommends from 9–12 months for high-risk areas). Neither is universally due at 15 months. **Clinical Pearl:** The NIS 2023 specifies the 16–24 month window for MR booster, DPT Booster-1, and OPV booster. At 15 months, the child is just entering this window. The most critical pending vaccines are **Measles-2 (MR/MMR) and DPT Booster-1**. [cite: NIS 2023 (Ministry of Health & Family Welfare, India); IAP Immunization Guidelines 2023]