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Injecting a person with a killed-bacteria vaccine can protect that individual from disease because the proteins of the bacteria:

Remain in the body and live bacteria later prey on them instead of live tissue.


Bind with receptors in the body, so that live bacteria cannot bind with them later.


Stimulate the production of antibodies which can be manufactured later response to infection.,

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W0lf93
The final answer is the most accurate. When the killed-bacteria are injected into the body, antibodies are then produced as a way of combating these bacteria. When the live bacteria are later found to be in the system, the antibodies are already present and more easily produced as a way of killing off these new invaders quicker.

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