In the adaptive immune response, effective immunity cannot be detected for several days after the first contact with the pathogen.

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Quizplus · Accepted Answer

This is because the adaptive immune response takes time to develop and requires the activation, proliferation, and differentiation of specific immune cells. This process can take several days to occur, during which time the pathogen may continue to replicate and cause harm to the host. Once the adaptive immune response is established, however, it can provide long-lasting protection against the pathogen through the production of memory cells.

In the Adaptive Immune Response, Effective Immunity Cannot Be Detected