Answer the questions below as completely and as thoroughly as possible and where appropriate include a specific example to illustrated. Answer the question in essay form (not as an outline or as bullets) using complete sentences. You may use diagrams to supplement your answers, but a diagram alone without appropriate discussion will not be adequate for full credit. Cite sources of information you used to answer the questions or that support your answer.

26. Explain how a secondary antibody response to an antigen may prevent a bacterial or viral disease when the primary adaptive (acquired) immune response to that antigen did not protect the person from the disease. Be specific about the types of cells and products involved in the secondary responses and the type of response.