Fox Health: Polio vaccines may not always work

[riky]

Polio vaccines may not always work

The standard polio vaccine may not always work, as vaccinations didn't prevent polio in people in the Republic of the Congo during an outbreak there in 2010, a new study shows<img src="http://feeds.feedburner.com/~r/foxnews/health/~4/xmAM-0L453g" height="1" width="1"/>

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