Active immunity is a natural process, whereas passive immunity is generated artificially.
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Q30: Once a helper T-lymphocyte recognizes an antigen,it
Q115: A variety of lymphatic cells are involved
Q116: Vaccines are effective because they
A) immediately stimulate
Q118: The secondary response of the immune system
Q119: Active immunity requires
A) the transfer of antibodies
Q121: Lymphocytes don't stay in one lymphatic structure
Q122: An individual gets a snake bite and
Q123: The display of an antigen on the
Q124: During development, T lymphocytes are tested to
Q125: Activation of a CD4+ cell requires an
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