The Electronic Privacy Information Center filed a Freedom of Information Act (FOIA) request asking federal officials to disclose how much user search data the company has recently transmitted to the Centers for Disease Control and Prevention, or CDC, as part of its .
Concern stems from what privacy groups claim is a disturbing lack of transparency surrounding the method Google is using to predict flu outbreaks. that all of the data used is made anonymous and aggregated, but there has been no independent verification of how search queries are used and transformed into data for Google Flu Trends, the privacy groups say.
"What we are basically saying is that if Google has found a way to ensure that aggregate search data cannot be used to re-identify the people who provided the search information, they should be transparent about that technique," said Marc Rotenberg, Electronic Privacy Information Center's president.
Rotenberg said the issue is important because the same techniques Google is using to predict flu outbreaks could be applied to tracking other diseases, including those that the urgency to contain the disease could be a whole lot greater with, such as SARS. "Let's say we have a spike in Detroit of SARS and the police say we want to know who in Detroit submitted those searches. How can Google ensure that this can't be done? The burden is on Google," Rotenberg said.
Google Flu Trends was publicly disclosed in November and has been described by the company as Web tool to help individuals and health care professionals obtain influenza-related activity estimates for all U.S. states up to two weeks faster than traditional government disease surveillance systems.