Why vaccines work

Tuesday, February 17, 2015

Joe Hanson, the host of YouTube educational channel It's Okay To Be Smart, explains how vaccinations work.
As more and more parents are choosing not to vaccinate their children or are vaccinating them later, diseases like measles are making a comeback. Are vaccines safe? How do they work? This week we look at why are people afraid of something that has saved so many lives, and look at the history and science of vaccines.

It's Okay To Be Smart


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