WATCH: How vaccinations work to strengthen the immune system
Learn how vaccinations work with this thorough videographic.
They're called preventable diseases for a reason. (iStock)
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Almost 20 million children missed out on potentially life-saving vaccinations last year, the UN said recently, as surging measles cases highlighted "dangerous" gaps in efforts to shield kids from preventable diseases. 

Watch this videographic to understand how vaccinations work:  

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