Question

in which of the following scenarios is it possible for a person to have a rapid secondary immune response to an illness despite contracting that particular illness for the first time?
correct answer(s)

vaccination adaptive immune response
passive immunity second line of defense

Explanation:

A secondary immune response requires pre-existing memory cells from prior exposure. Vaccination introduces antigens (e.g., weakened pathogens) that trigger the adaptive immune system to form memory cells. When the person later contracts the actual illness (first time with the live pathogen), these memory cells enable a rapid secondary response. Passive immunity involves receiving pre-made antibodies (no memory cells), adaptive immune response is the general system (not a scenario), and the second line of defense is innate (no memory).

Answer:

vaccination