BPSC – Combined Competitive Examination · প্রশ্ন 18
How do COVID vaccines stimulate an immune response?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (C) By introducing a harmless piece of SARS-CoV-2 virus
ব্যাখ্যা
Vaccines (mRNA, vector, protein, inactivated) expose the body to harmless viral parts so it makes its own antibodies.
- (A) ভুল
Wrong: most approved COVID vaccines are not live-attenuated.
- (B) ভুল
Wrong: unsafe; not how vaccines work.
- (C) সঠিক
Correct: they present a harmless antigen (e.g. spike protein or its code) to train immunity.
- (D) ভুল
Wrong: that is passive immunisation, not vaccination.