silver_surfer
04-12-2015, 07:31 AM
Published on 10 Apr 2015
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.
https://www.youtube.com/watch?v=r90PPz33wms
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.
https://www.youtube.com/watch?v=r90PPz33wms