|United States Flu Activity|
|Influenza estimate|| Google Flu Trends estimate |
United States: Influenza-like illness (ILI) data provided publicly by the U.S. Centers for Disease Control.
Approximately how many cases of flu were there in 2005?
When were Google estimates of flu numbers closest to reported data?
When were Google estimates least accurate?
If you have time, http://www.google.org/flutrends/us/ is interesting as well.