Flu Activity and Surveillance

Maintained/created by: Centers for Disease Control and Prevention (CDC)
Website: http://www.cdc.gov/flu/weekly/fluactivitysurv.htm
Geographic unit of data: U.S. national, U.S. regional, U.S. State

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The Flu Activity and Surveillance site at the Centers for Disease Control and Prevention (CDC) collects information on influenza activity in the United States. The information is collected in five categories: viral surveillance, outpatient illness surveillance, mortality surveillance, hospitalization surveillance, and a summary of the geographic spread of influenza. The purpose of the Flu Activity and Surveillance is to: find out where and when influenza is occurring, track illnesses, determine which influenza viruses are circulating, detect changes in viruses, and to measure influenza’s impact on death.

Data Notes

Users can download the previously released weekly reports and maps of the weekly spread of influenza in the United States. The weekly reports provide information on influenza-related pediatric deaths and hospitalizations and on visits to outpatient clinics. Data is also presented on the state and international levels. The Flu Activity and Surveillance website releases weekly reports on influenza activity between October and May. Information is available for every year since 1997.