A subsequent exposure to the same antigen elicits a(n) _____, characterized by a rapid increase in IgG antibody associated with higher levels, a prolonged elevation, and a more gradual decline in antibody levels.

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The anamnestic immune response, also known as the secondary immune response, occurs upon subsequent exposure to the same antigen. This response is characterized by a rapid increase in IgG antibody associated with higher levels, a prolonged elevation, and a more gradual decline in antibody levels. Option A refers to the primary immune response, which occurs upon initial exposure to an antigen. Option C, the opsonin immune response, involves the binding of opsonins to antigens to enhance their recognition by phagocytic cells. Option D, the innate immune response, is the body's immediate, non-specific defense against pathogens.

A Subsequent Exposure to the Same Antigen Elicits A(n) _____