Why does a vaccine protect a person later?
Answer and explanation
Correct answer: D. It leads to the formation of memory cells
- Step 1: The harmless antigen triggers an immune response and memory cells remain.
Answer
It leads to the formation of memory cells.
Why not the others: It contains antibiotics that kill the pathogen, It makes the person produce more red blood cells and It changes the person's DNA do not fit.
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More Human physiology and ecology questions
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