Question

BCG vaccine contains non-virulent strain of:

• A. Bacillus subtilis
• B. Bacillus Pumilus
• C. Mycobacterium leprae
• D. Mycobacterium bovis

Hint:

The BCG vaccine contains an attenuated strain of Mycobacterium bovis, used to prevent tuberculosis.

Answer 1

The Correct Option is D

Step 1: Understanding BCG Vaccine 
The Bacillus Calmette-Guérin (BCG) vaccine contains a live, attenuated strain of Mycobacterium bovis, which is used for tuberculosis prevention. Step 2: Evaluating the Options 
- Bacillus subtilis: A different bacterium, not used in BCG. 
- Bacillus Pumilus: Another unrelated bacterium. 
- Mycobacterium leprae: Causes leprosy, not used in the BCG vaccine. 
- Mycobacterium bovis: Correct, the BCG vaccine is derived from an attenuated strain of Mycobacterium bovis. 
Step 3: Conclusion 
BCG vaccine uses Mycobacterium bovis, a non-virulent strain for immunization.