Vaccines work by introducing a weakened form of the germ to your body, so that the immune system can learn to recognize it. Your body then builds its defenses so it’s prepared to fight off a real attack later in life. And no, vaccines do not cause autism. They neither give you peanut allergy.

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Video via – AsapSCIENCE
Further Readings and References @ Vaccine Information, History of Vaccines, Scientific American, Sparkonit

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