Contact: Phil Sneiderman
Johns Hopkins University
Caption: This map indicates the prevalence of flu in the United States in the first week of January 2012, as measured by the volume of flu-related tweets. States with higher flu rates are colored in a darker red. Last year's flu affected relatively few Americans.
Credit: Mark Dredze/JHU
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Related news release: Using Twitter to track the flu: A better way to screen the Tweets