Evidences from an exhaustive survey of literature has revealed that during the early stages
pertaining to the historical development of immunological experimentation, the, biologists duly learned
that
‘certain specific types of immunity’
to the same species) by actually
transferring serum from immunized to nonimmunized animals.
Importantly, other kinds of immunity could not be transferred effectively
via blood serum. Obviously, at a
much later stage it was duly understood that these special types of immunity may be easily and conveniently
transferable only when certain specific lymphocytes were transferred actually.
Based on the further extensive and intensive researches carried out by the
‘immunologists’ across
the globe ultimately accumulated copious volumes of valuable informations and results that are now wellknown
to reflect the
two major segments of the so called vertebrate immune system, namely :
(
a) immunity associated with serum-transfer reflecting the activities of the humoral (antibody-mediated) immune system*, and
(
b) immunity associated with transfer of lymphocytes reflecting the activities of the cellmediated
immune system*.
Nevertheless, these
two aforesaid major segments exert their actions both individually, and togetherin order to safeguard the humans from ailment irrespective of their age, race, and gender.