Weakened germ: They take the germ you are trying to protect against, take away its ability to cause illness and inject its weak carcass into your body. This way your immune system gets challenged by the germ without it being able to cause infection.
Answered 1/5/2019
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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