(Source: CNN News) http://edition.cnn.com/2008/HEALTH/conditions/11/11/google.flu.trends/index.html

Google knows that you might do something like that, and it also knows which U.S. state you’re in. Now, it’s putting that information together in a tool that Google says could detect flu outbreaks faster than traditional systems currently in use.

Google’s new public health initiative, Google Flu Trends, looks at the relative popularity of a slew of flu-related search terms to determine where in the U.S. flu outbreaks may be occurring.

“What’s exciting about Flu Trends is that it lets anybody — epidemiologists, health officials, moms with sick children — learn about the current flu activity level in their own state based on data that’s coming in this week,” said Jeremy Ginsberg, the lead engineer who developed the site.

The tool, which launched Tuesday, operates on the idea that there’s likely to be a flu outbreak in states where flu-related search terms are currently popular.

The Centers for Disease Control and Prevention collaborated with Google on the project, helping validate and refine the model, and has provided flu tracking data over a five-year period, said Dr. Joseph Bresee, chief of the epidemiology and prevention branch in the CDC’s influenza division.

“Sacrificing accuracy may not necessarily carry a big penalty if you’re able to predict increasing flu incidence as well as the other systems, and do it more rapidly,” he said.

Still, there are limitations, Bresee said. The tool may miss cases of influenza spreading among elderly people, because they are less likely to use the Internet than younger people, Stafford said. He also noted that many people who search for flu-related terms have viral infections that are not actually influenza.

Google has also taken into account that people sometimes look for flu-related terms in response to certain news headlines and do not actually have the flu, Ginsberg said. The tool looks for terms that, for example, reflect searches by a person who has chest congestion or wants to buy a thermometer, he said.

Flu Trends may also help doctors make diagnoses, Ginsberg said.

“I would be very hesitant to diagnose influenza at this point in the year, but if the tool tells me influenza in California is really increasing dramatically, I might be more likely or willing to diagnose,” Stafford said.

Influenza is responsible for more than 500,000 deaths worldwide each year, according to the World Health Organization.

Flu Trends cannot be used to identify individual users, the company statement said. The search engine relies on aggregated counts, made anonymous, of how often certain search terms occur each week. But every computer connected to the Internet has its own internet protocol address, or IP address, which reveals its location to Google.

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