BPSC – Combined Competitive Examination · પ્રશ્ન 22

How do vector vaccines work to provide immunity?

By introducing a weakened or inactivated virus into the body
By directly attacking and destroying pathogens in the body
By placing the virus's genetic material in a modified version of a different virus
By entering directly into cells and enabling them to create spike proteins

જવાબ બતાવો અને સમજૂતી

જવાબ: (C) By placing the virus's genetic material in a modified version of a different virus

સમજૂતી

Viral-vector vaccines (e.g. Covishield) use a modified adenovirus to deliver the spike-protein gene.

(A) ખોટો
Wrong: that describes attenuated/inactivated vaccines.
(B) ખોટો
Wrong: vaccines do not attack pathogens directly.
(C) સાચો
Correct: a harmless 'vector' virus carries the target gene into cells.
(D) ખોટો
Wrong: that describes mRNA vaccines.