An antiserum to a snake toxin can be obtained by injecting the toxin into a horse. The antiserum is made from plasma taken from the horse a few weeks later. The antiserum is used to treat a person who has been bitten by the same species of snake.
What does the person’s treatment bring about?
1 )
artificial active immunity
artificial passive immunity
3 )
natural active immunity
4 )
natural passive immunity
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