True about DPT vaccine ?
**Core Concept**
The DPT vaccine is a combination vaccine that protects against diphtheria, pertussis (whooping cough), and tetanus. It contains inactivated or attenuated components of these pathogens to elicit an immune response in the recipient.
**Why the Correct Answer is Right**
The DPT vaccine contains the diphtheria toxoid, which is a modified form of the diphtheria toxin that is produced by the bacterium Corynebacterium diphtheriae. The pertussis component is usually in the form of whole-cell pertussis or acellular pertussis, which contains inactivated or purified components of the Bordetella pertussis bacteria. The tetanus component is a toxoid, which is a modified form of the tetanus toxin produced by the bacterium Clostridium tetani. The combination of these components in the DPT vaccine provides immunity against these three serious infections.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the components of the DPT vaccine.
**Option B:** This option is incorrect because it does not provide any information about the DPT vaccine.
**Option C:** This option is incorrect because it is incomplete and does not mention the pertussis component.
**Clinical Pearl / High-Yield Fact**
It is essential to complete the full series of DPT vaccinations to ensure long-term immunity against diphtheria, pertussis, and tetanus. Booster shots are typically given every 10 years to maintain immunity.
**Correct Answer:** D.