Fox Health: Dr. Manny: Why are there deadly viruses in the world?

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Dr. Manny: Why are there deadly viruses in the world?

The field of medicine has made great strides over the last century, but it seems for every deadly virus we learn to control and prevent, there's another waiting in the wings<img src="http://feeds.feedburner.com/~r/foxnews/health/~4/A_Zll7DQ18w" height="1" width="1"/>

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