A History of Vaccination
Clip: Season 41 Episode 14 | 4m 48s
Vaccination began as a traditional therapy over a thousand years ago.
Aired: 09/04/14
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Clip: Season 41 Episode 14 | 4m 48s
Vaccination began as a traditional therapy over a thousand years ago.
Aired: 09/04/14
Problems Playing Video? | Closed Captioning