Immunity and Vaccines Explained
Clip: Season 41 Episode 14 | 2m 11s
Vaccines work with our immune system to keep us from getting sick.
Aired: 09/04/14
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Clip: Season 41 Episode 14 | 2m 11s
Vaccines work with our immune system to keep us from getting sick.
Aired: 09/04/14
Problems Playing Video? | Closed Captioning