What are the top ten emerging diseases in the US and worldwide?
http://www.who.int/trade/glossary/story022/en/
http://www.who.int/whr/1996/media_centre/executive_summary1/en/index5.html
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Here use next button at the bottom when you get there:
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Also for USA:
http://www.cdc.gov/search.do?queryText=%22emerging+diseases%22&action=search