How do COVID vaccines stimulate an immune response?

This question was previously asked in
69th BPSC Prelims Exam Official Paper (Held On: 30 Sept, 2023)
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  1. By introducing live attenuated SARS-CoV-2 virus
  2. By introducing a real SARS-CoV-2 virus
  3. By introducing a harmless piece of SARS-CoV-2 virus
  4. By introducing antibodies against SARS-CoV-2 virus 

Answer (Detailed Solution Below)

Option 1 : By introducing live attenuated SARS-CoV-2 virus
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Detailed Solution

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The correct answer is By introducing live attenuated SARS-CoV-2 virus.

Key Points

  •  Option 1: Covaxin falls under this category i.e., Inactivated or attenuated live SARS-CoV-2 virus.
  • Option 2: Covishield apparently falls under this category but it is a viral vector vaccine that uses an adenovirus found in Chimpanzees, ChAD0x1, and, not the SARS-CoV-2 virus.
  • Other options are obviously incorrect. Hence,  the correct answer is option 1.
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