Google says that certain search terms are good indicators of flu activity. Google Flu Trends uses aggregated data to estimate flu activity.
Google Flu Trends: http://www.google.org/flutrends/
Google Flu Regional Trends: http://www.google.org/flutrends/us/#US-IN (pull down menu on right hand side of screen to change state)
CDC Flu updates: http://www.cdc.gov/flu/weekly/fluactivitysurv.htm
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