Posted by Leah on Wednesday, February 24, 2010 at 12:16am.
Try some of these sites on disease control:
http://www.google.com/search?q=why+some+diseases+have+no+vaccine&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Sra
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