Question

Which of the following methods is correct for producing vector vaccines?

• A. By inserting genes for antigens of a pathogen into a nonpathogenic viral vector
• B. By inserting attenuated antigen to the pathogenic virus
• C. By inserting whole antigen to the pathogenic virus
• D. By inserting the antigenic component to host

Hint:

Vector vaccines use nonpathogenic viruses to deliver pathogen-specific antigens to the immune system.

Answer 1

The Correct Option is A

Step 1: Understanding Vector Vaccines 
Vector vaccines involve inserting genes encoding antigens from a pathogen into a harmless virus or bacterium, which then serves as a vector to deliver the antigens to the body. 
Step 2: Evaluating the Options 
- Inserting genes for antigens of a pathogen into a nonpathogenic viral vector: Correct, this is the standard method for producing vector vaccines. 
- Inserting attenuated antigen to the pathogenic virus: Incorrect, as this could make the virus pathogenic. 
- Inserting whole antigen to the pathogenic virus: Incorrect, as it could cause immune reactions or make the virus dangerous. 
- Inserting the antigenic component to host: Not the method used for vector vaccines. 
Step 3: Conclusion 
Vector vaccines use nonpathogenic viruses as carriers to deliver pathogen antigens.