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Flu activity nationwide is showing declines; however, activity levels vary from region to region and even from state to state. While flu activity may have peaked and be declining in some states, other states may still be on the upswing of their flu activity. This season began late and has been relatively mild so far, but it’s possible that sporadic influenza activity may continue for some time. During previous late seasons, activity has continued into May.

Influenza (Flu) Topics

Flu Basics

Symptoms, How Flu Spreads, Higher Risk Groups, 2010-2011 Flu Season, 2011-2012 Flu Season…

Prevention

Flu Vaccine Information, Vaccine Safety Information, NIVW, Infection Control…

Treatment/Antiviral Drugs

What to do, Symptoms, Antiviral Drugs…

Health Professionals

Vaccination, Antiviral Drugs, Infection Control, Diagnostic Testing, Patient Education, Clinician Communications and Training…

Free Resources

Printable Materials, Photos, Podcasts, Videos, PSAs, eCards, Badges & Buttons, Articles…

What’s New & Updated!

Flu News & Highlights, Diagnosis, Antiviral, Vaccination, Guidelines, Podcasts, Resources…

Flu Activity & Surveillance

US Map of Flu Outbreaks and Activity

CDC collects, compiles and analyzes information on influenza activity year round in the United States.

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International Flu

World map

This site provides updates to information on the international flu situation and CDC’s international flu program.

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USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348, New Hours of Operation 8am-8pm ET/Monday-Friday 
Closed Holidays - cdcinfo@cdc.gov