Describe how the principle of herd immunity works to protect unvaccinated individuals. What characteristics of the pathogen or the host do you think would most impact the degree to which this principle begins to take hold? 4. Compare and contrast innate and adaptive immunity by matching the following characteristics with the correct arm of immunity, using I for innate and A for adaptive a. Is the first to engage upon initial encounter with antigen_ b. Is the most pathogen specific c. Employs T and B lymphocytes d. Adapts during the response e. Responds identically during first and second exposure to the same antigen f. Responds more effectively during a subsequent exposure_ g. Includes a memory component h. Is the target of vaccination i. Can involve the use of PAMP receptors j. Involves antigen-specific receptors binding to pathogens k. Can be mediated by antibodies

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