Answer:
The principle of vaccination is based on
the property of 'memory' of immune system .In vaccination, a preparation of
antigenic proteins or inactivated/live but weakened pathogens is introduced
into the body. The antigens generate primary immune response by producing
antibodies along with memory B-cells and T-cells.
When
the vaccinated person is attacked by the same pathogens, the existing memory B-cells
and T-cells recognize the antigen and overwhelm the invaders with massive
production of lymphocytes and antibodies, Hepatitis-B vaccine is produced from
yeast.
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