The graph shows levels of primary and secondary immune responses versus time. the secondary response is greater and more rapid than the primary response. what does the graph best indicate about primary and secondary immune response?a) a vaccine elicits a primary response, after which the subsequent infection is fought strongly and more rapidly. b) an infection elicits a primary response, after which subsequent vaccination causes a heightened secondary response. c) a vaccine triggers the immune system twice, but does not affect the elicited immune response on subsequent infection. d)a vaccine causes a primary immune response, but does not affect the elicited immune response on subsequent infection.
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The graph shows levels of primary and secondary immune responses versus time. the secondary response...
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