Flu Activity & Surveillance

Note: “Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2019–20 Influenza Season” has been published. CDC recommends annual influenza vaccination for everyone 6 months and older with any licensed, influenza vaccine that is appropriate for the recipient’s age and health status, (IIV, RIV4, or LAIV4) with no preference expressed for any one vaccine over another. Content on this website is being updated to reflect this most recent guidance. More information about the upcoming 2019-2020 flu season is available.

Summary of Weekly FluView

A brief overview of flu activity in the United States highlighting key data points from the weekly influenza surveillance report, FluView.

FluView Weekly U.S. Influenza Surveillance Report

A weekly influenza surveillance report prepared by the Influenza Division. All data are preliminary and may change as more reports are received.

ILINet State Activity Indicator Map

Data collected in ILINet are used to produce a measure of ILI(influenza like illness) activity* by state. Activity levels are based on the percent of outpatient visits in a state due to ILI.

FluView Interactive, Influenza Surveillance Data the Way You Want It

Influenza surveillance data the way you want it. This series of dynamic visualizations allow any Internet user to access influenza information collected by CDC’s monitoring systems.

Current United States Flu Activity Map

The influenza activity reported by state and territorial epidemiologists indicates geographic spread of influenza viruses, but does not measure the severity of influenza activity.