Second generation vaccines are prepared by recombinant DNA technology. Which out of the following are the examples of such vaccines ?

Options

A. Hepatitis B virus vaccine
B. Herpes virus vaccine
C. Salk's polio vaccine
D. Both (a) and (b)

Answer

**Step-by-Step Solution:**

1. **Understanding Second Generation Vaccines**:
- Second generation vaccines are those that are developed using recombinant DNA technology, which involves genetic engineering to produce antigens that can stimulate an immune response.

2. **Identifying Examples**:
- The question asks for examples of second generation vaccines. We need to look for vaccines that are developed using recombinant DNA technology.

3. **Examples of Second Generation Vaccines**:
- **Hepatitis B Virus Vaccine**: This vaccine is produced using recombinant DNA technology. It is derived from transgenic yeast that has been genetically engineered to produce the hepatitis B surface antigen.
- **Herpes Virus Vaccine**: This vaccine is also an example of a second generation vaccine developed using recombinant DNA technology.
- **Pneumonia Vaccine**: While there are pneumonia vaccines, not all are classified as second generation vaccines. The specific context of recombinant DNA technology must be considered.

4. **Conclusion**:
- Based on the examples provided, both the Hepatitis B virus vaccine and the Herpes virus vaccine are classified as second generation vaccines developed through recombinant DNA technology. Therefore, the correct answer is that both A (Hepatitis B virus vaccine) and B (Herpes virus vaccine) are examples of second generation vaccines.

5. **Final Answer**:
- The correct option is both A and B (Hepatitis B virus vaccine and Herpes virus vaccine).

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