Question

What are recombinant vaccines? Explain their types.

Hint:

Remember: Recombinant vaccines → Gene-based → Safe and specific.

Answer 1

Concept: Recombinant vaccines are developed using genetic engineering techniques to produce safer and more effective vaccines.
Step 1: Definition.
Recombinant vaccines are vaccines produced by inserting the gene encoding an antigen into a suitable host organism using recombinant DNA technology.
Step 2: Working principle.

• The gene for a specific antigen is isolated
• It is inserted into a vector (like plasmid)
• The vector is introduced into a host cell (e.g., bacteria or yeast)
• The host produces the antigen, which is used as a vaccine

Step 3: Types of recombinant vaccines.

• Subunit vaccines:
  • Contain only specific antigenic parts of the pathogen
  • Example: Hepatitis B vaccine
• DNA vaccines:
  • Contain DNA encoding the antigen
  • Host cells produce antigen internally
• Vector-based vaccines:
  • Use harmless viruses or bacteria as carriers
  • Deliver antigen gene into host cells

Step 4: Advantages.

• Safe and specific
• No risk of infection
• Can be produced in large quantities

Step 5: Conclusion.
Thus, recombinant vaccines are advanced vaccines produced using biotechnology for effective disease prevention.