## DPT Booster Dosing in National Immunisation Schedule **Key Point:** The first booster dose of DPT is administered at 18 months of age in India's National Immunisation Schedule. ### DPT Vaccination Schedule in India | Age | Vaccine | Dose Type | | --- | --- | --- | | 6 weeks | DPT | Primary 1 | | 10 weeks | DPT | Primary 2 | | 14 weeks | DPT | Primary 3 | | **18 months** | **DPT** | **Booster 1** | | 5–6 years | DPT | Booster 2 | **High-Yield:** The primary series of DPT is completed by 14 weeks (three doses at 6, 10, and 14 weeks). The first booster is given at 18 months, followed by a second booster at school entry (5–6 years). **Clinical Pearl:** The 18-month booster is crucial for maintaining immunity against diphtheria, tetanus, and pertussis. This timing allows adequate spacing (4 months) from the last primary dose and ensures protection before the child enters the community setting more actively. **Mnemonic:** **DPT Timeline: 6-10-14 (Primary), 18 (Booster-1), 5-6 (Booster-2)** — easy to remember as the primary series is completed by 14 weeks, then boosters at 18 months and school entry. [cite:Park 26e Ch 6]
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