When is the immune response most intense?

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(B) The immune response is most intense during the secondary immune response. When the body encounters a pathogen for the first time,it generates a pr

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When our body comes into contact with the same pathogen for the second time.

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(B) The immune response is most intense during the secondary immune response. When the body encounters a pathogen for the first time,it generates a primary immune response,which is of low intensity. However,when the same pathogen enters the body for the second time,the memory cells ($B$-cells and $T$-cells) recognize it immediately and mount a highly intensified secondary or anamnestic response. This is the principle behind vaccination.

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