The principle of immunisation or vaccination is based on which property of immune system1) To produce antigens2) To retain memory3) To differentiate self and non-self4) All of the abovetion 1

The principle of immunisation or vaccination is based on which prope

1.	The principle of immunisation or vaccination is based on which property of immune system1) To produce antigens2) To retain memory3) To differentiate self and non-self4) All of the abovetion 1
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