Why can a person who has had chickenpox usually not catch it again?
Answer and explanation
Correct answer: D. Memory cells respond rapidly
- Step 1: Memory B and T cells give a quick, strong secondary response.
Answer
Memory cells respond rapidly.
Why not the others: Their skin has become thicker, They have a vaccine in the body and The virus has been removed from the world don't fit.
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More Immunity, DNA Technology and Change Over Time questions
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