NOVA | Immunity and Vaccines Explained | PBS

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  • Video Length: 2minutes : 12second

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Watch the full-length episode at http://video.pbs.org/video/2365322027/?Utm_source=youtube&utm_medium=pbsofficial&utm_campaign=nova_covefullprogram (US Only) Vaccines work with our immune system to keep us from getting sick. For a full list of credits, visit our website: http://to.pbs.org/1y6EMUK

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