Answer:
When the body encounters a pathogen for the
first time, it mounts an immune response by generating antibodies. This
response is of low intensity. Subsequent encounter with the same pathogen
elicits a highly intensified secondary response,
This is ascribed to the fact that our
body appears to have memory of the first encounter. This type of secondary
immune response is elicited by memory T-cells, B-cell which keep ready to mount
a rapid and vigorous attack as soon as the same pathagen infects the body
again.
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