Posted by nathalie on Wednesday, August 24, 2011 at 9:18pm.
Try some of the following links for information:
1. http://www.google.com/search?q=purposes+of+public+health+surveillance%3F&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
2. http://www.google.com/search?q=how+is+public+health+surveillance+implemented+%26+utilized&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Your second part of the post is not clear. What is the antecedent to "they?"
Sra
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