21. What are passive and
active immunization?
According to the duration of
the protection how do these
types of immunization differ?

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Active immunization is that which an
antigen penetrates body triggering
the primary response and the
production memory lymphocytes and
antibodies provide faster and more
immune defense in future
by the same antigen.
immunization is that in
immunoglobulins against an antigen
inoculated in the body provide
protection in case body becomes
infected by antigen.

Active immunization tends be longer
lasting than immunization since
in the type as well as ,
specific memory lymphocytes remain
the circulation. In the
immunization the duration of
protection is that of duration of the
antibodies the circulation.