A vaccine works by
A. stimulating the body to produce antibodies against a pathogen
B. killing all bacteria in the body directly
C. supplying vitamins
D. increasing the number of red blood cells
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Best answer
Answer: A. stimulating the body to produce antibodies against a pathogen
A vaccine contains weakened or killed pathogens (or their parts) that train the immune system to make antibodies.
Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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