As per national immunization schedule, 1ST DPT booster has to be given at
**Core Concept**
The national immunization schedule is a set of guidelines outlining the recommended vaccinations for infants and children in a particular country. The schedule includes the timing and number of doses for various vaccines, including the DPT (diphtheria, pertussis, and tetanus) vaccine. The DPT booster shots are administered to provide long-term protection against these diseases.
**Why the Correct Answer is Right**
The 1st DPT booster is typically given at 15-18 months of age as part of the national immunization schedule. This booster dose helps to maintain the immunity levels against diphtheria, pertussis, and tetanus, which are essential for preventing these diseases. The booster dose is usually administered after the primary series of DPT vaccinations, which are given at 6, 10, and 14 weeks of age.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the DPT vaccine is not given at birth. The primary series of DPT vaccinations typically starts at 6 weeks of age.
* **Option B:** This option is incorrect because the 1st DPT booster is not given at 6 months of age. While the primary series of DPT vaccinations is completed by 6 months of age, the 1st DPT booster is given later, at 15-18 months of age.
* **Option C:** This option is incorrect because the 1st DPT booster is not given at 12 months of age. While some vaccines are administered at 12 months of age, the 1st DPT booster is typically given at 15-18 months of age.
**Clinical Pearl / High-Yield Fact**
It's essential to note that the national immunization schedule may vary depending on the country or region. Healthcare providers should always follow the recommended schedule for their area to ensure that children receive the necessary vaccinations for optimal protection.
**Correct Answer:** D. 18 months