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                      Only Three Countries Left With Polio

   by Carol Pearson

   Sixty years ago this month Dr. Jonas Salk's polio vaccine was declared
   safe and effective. It has since been given to billions of children
   around the globe. And, as VOA's Carol Pearson reports, in just a few
   years, the entire world could be polio free.
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   [1]http://www.voanews.com/media/video/2713636.html

References

   1. http://www.voanews.com/media/video/2713636.html