Indicate whether the characteristic applies to active immunity or passive immunity by writing the appropriate letter in the blank using the following answer code.
a.active immunity
b.passive immunity
-Exposure to antigen required for immunity to develop

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The Answer of Indicate whether the characteristic applies to active immunity or passive immunity by writing the appropriate letter in the blank using the following answer code.
a.active immunity
b.passive immunity
-Exposure to antigen required for immunity to develop

Indicate Whether the Characteristic Applies to Active Immunity or Passive