Vaccines help strengthen the human immune system.

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LeopoldBloom · M Best Comment

Technically, vaccines don't strengthen or weaken the immune system. They basically train the immune system to react to certain pathogens and neutralize them. It would be more accurate to say that vaccines augment the immune system.

LordShadowfire · M

@LeopoldBloom Okay, but to me, that's kind of the same thing. It teaches your immune system how to defend itself. You're technically more accurate than I am, though.