Everything old is new again

To read the story, click on http://www.npr.org/blogs/goatsandsoda/2015/04/12/398806324/jonas-salks-polio-vaccine-makes-a-comeback?utm_source=facebook.com&utm_medium=social&utm_campaign=npr&utm_term=nprnews&utm_content=20150412
To read the story, click here.
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