Twitter Flu Map 2013 (image) Johns Hopkins University Share Print E-Mail Caption This map indicates the prevalence of flu in the United States in the first week of January this year, 2013, as measured by the volume of flu-related tweets. States with higher flu rates are colored in a darker red. This year, in contrast to last January, the nation is awash in flu cases. Credit Mark Dredze/JHU Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.