INFOGRAPHIC 31.9 MEMORY CELLS MOUNT AN AGGRESSIVE SECONDARY RESPONSE
The adaptive immune system’s primary humoral response is slow and produces low levels of antibodies. Upon subsequent exposures, memory cells produced during the primary response respond quickly and trigger B cells to produce high levels of antibodies. This secondary response is so rapid and effective that illness does not occur. The secondary response of cell-mediated immunity and cytotoxic T cells is also quick and effective.