The quick response of the immune system upon a second encounter with an antigen is due to:
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Correct answer: Memory cells
Memory B and T cells 'remember' the specific antigen from the first exposure. When the same antigen enters the body again, these cells proliferate and differentiate rapidly to eliminate the threat before symptoms occur.
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More Vaccines and their role questions
- MMR vaccine provides protection against which set of diseases?
- What happens when a 'killed' vaccine is injected into the body?
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