Question:
BCG vaccine is a
BCG vaccine is a
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Vaccines come in several types — live attenuated (weakened live organism), killed/inactivated, toxoids (inactivated toxins), and recombinant (genetically engineered antigens).
Updated On: Jun 24, 2026
- Live attenuated vaccine
- Killed vaccine
- Toxoid
- Recombinant vaccine
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The Correct Option is A
Solution and Explanation
Concept:
Vaccines come in several types — live attenuated (weakened live organism), killed/inactivated, toxoids (inactivated toxins), and recombinant (genetically engineered antigens). The BCG vaccine protects against tuberculosis, and we need to classify it.
Step 1: BCG stands for Bacillus Calmette–Guérin. It is made from a strain of Mycobacterium bovis that has been repeatedly subcultured until it lost its disease-causing ability while still being alive. A weakened but living organism is exactly what defines a live attenuated vaccine.
Step 2: So BCG is not killed, not a toxoid, and not recombinant — it is the classic example of a live attenuated bacterial vaccine, which is why it produces strong, long-lasting immunity.
Answer: Option (1) — BCG is a live attenuated vaccine. (1)
Vaccines come in several types — live attenuated (weakened live organism), killed/inactivated, toxoids (inactivated toxins), and recombinant (genetically engineered antigens). The BCG vaccine protects against tuberculosis, and we need to classify it.
Step 1: BCG stands for Bacillus Calmette–Guérin. It is made from a strain of Mycobacterium bovis that has been repeatedly subcultured until it lost its disease-causing ability while still being alive. A weakened but living organism is exactly what defines a live attenuated vaccine.
Step 2: So BCG is not killed, not a toxoid, and not recombinant — it is the classic example of a live attenuated bacterial vaccine, which is why it produces strong, long-lasting immunity.
Answer: Option (1) — BCG is a live attenuated vaccine. (1)
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