25. What are natural active
immunization and artificial
active immunization?

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Natural active immunization is in
which a previous infection
induces the primary response,
specific memory cells produced and
the individual immune to new
infections the antigen. This is
happens in diseases that people
only once in , like mumps and
chickenpox.

active immunization is that
which the primary immune is
caused by the into an
individual of prepared
antigens. This is case with vaccines.