 
As the current (H1N1 Flu) Swine Flu outbreak is the biggest concern for Mexico and other parts of world. United States has also seen a case of death because of this in Texas. Google Flu Trend which was launched in November 2008 is able to provide the data as close as Centers for Disease Control and Prevention (CDC) of U.S.
You can have a look at the “United States Flu Activities” as below,
The Flu trend in Mexico as follows,
This trend is based on the search data related to Flu, but then the data also went thru so many analysis to make it reliable and accurate. Google Engineers are aware that everyone who search for the term “Flu” are not sick and Google can’t take that data to prepare this sheet. Otherwise everyone can use Google Insight Search to get the search trend about a keyword.
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The exact information for H1N1 Flu (Swine Flu) in United States is available on CDC website where it is stated that there are 279 confirmed cases of Swine Flu in 36 States out of which 1 case of Death in Texas.
Go ahead and track the daily trend of Swine Flu in United States on Google Flu Trend and CDC website.