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Influenza (Flu)
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    Season Summaries
    • Summary of the 2014-2015 Influenza Season
    • Seasonal Influenza Vaccine Effectiveness, 2014-2015
    • Vaccine Benefits from the 2014 – 2015 Flu Season
    Key Studies and News Reports from the 2014 – 2015 Flu Season
    • Flu Antivirals Drugs continue to be Under-utilized in High-Risk Patients February 26, 2015
    • New CDC study highlights burden of pneumonia hospitalizations on U.S. children February 25, 2015
    • CDC Study: Flu Vaccine Saved 40,000 Lives During 9 Year Period March 30, 2015
    Page last reviewed: December 4, 2018
    Content source: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)
    home Seasonal Influenza (Flu)
    • About Fluplus icon
      • What You Need to Know
      • When is Flu Season
      • How Flu Spreads
      • Understanding Influenza Viruses plus icon
        • Types of Influenza Viruses
        • How Flu Viruses Can Change
        • Antigenic Characterization
        • Genetic Characterization
        • Reconstruction of the 1918 Influenza Pandemic Virus
        • Advanced Molecular Detection
      • Burden of Influenzaplus icon
        • Preliminary In-Season 2019-2020 Burden Estimates
        • How CDC Estimates Burden
        • Why CDC Estimates the Burden of Flu
        • Past Seasons
        • Frequently Asked Questions
      • How CDC Classifies Flu Severity
      • Glossary of Influenza (Flu) Terms
      • Questions & Answers
    • Who is at High Risk for Flu Complicationsplus icon
      • Adults 65 & Over
      • Pregnant Womenplus icon
        • Flu Vaccine Safety and Pregnant Women
      • Asthma
      • Heart Disease & Stroke
      • Diabetes
      • HIV/AIDS
      • Cancer
      • What Parents Need to Knowplus icon
        • Caregivers of Infants
        • Young Children
        • Children With Neurologic Conditions
        • Children and Antiviral Drugs
        • Mixing Oseltamivir Capsules for Children
    • Flu Seasonplus icon
      • What You Need to Know for 2019-20
      • Health Care Providers
      • Past Flu Seasonsplus icon
        • 2018-2019
        • 2017-2018
        • 2016-2017
        • 2015-2016
        • 2014-2015
        • 2013-2014
        • 2012-2013
        • 2011-2012
        • 2010-2011
        • 2009-2010
        • 2007-2008
        • 2006-2007
    • Prevent Fluplus icon
      • How to Prevent Fluplus icon
        • Preventive Actions
      • Key Facts About Flu Vaccines
      • Who Needs a Flu Vaccine & Whenplus icon
        • Who Should & Who Should NOT Get Vaccinated
      • Vaccine Benefitsplus icon
        • Publications on Vaccine Benefits
      • Different Flu Vaccinesplus icon
        • Flu Shot
        • Live Attenuated Influeza Vaccine (LAIV)/Nasal Spray Vaccine
        • Quadrivalent Influenza Vaccine
        • High-Dose Flu Vaccine
        • Adjuvanted Flu Vaccine
        • Cell-Based Flu Vaccine
        • Recombinant Flu Vaccine
        • Intradermal Flu Vaccine
        • Flu Vaccination by Jet Injector
      • How Flu Vaccines are madeplus icon
        • Advancements in Influenza Vaccines
        • Selecting Viruses for the Seasonal Influenza Vaccine
        • Projects to Improve Flu Vaccines
      • Flu Vaccine Safetyplus icon
        • Vaccine Safety Questions & Answers
        • Febrile Seizures Following Vaccination
        • Flu Vaccine and People with Egg Allergies
        • Guillain-Barré Syndrome (GBS)
        • Thimerosal
      • Misconceptions about Flu Vaccines
      • Healthy Habits to Help Prevent Flu
      • Vaccine Supply & Distributionplus icon
        • Vaccine Supply for 2019-2020 Season
        • Frequently Asked Questions on Vaccine Supply
        • Historical Reference of Vaccine Doses Distributed
    • Flu Vaccines Workplus icon
      • How Well Flu Vaccines Work
      • CDC’s Vaccine Effectiveness Networksplus icon
        • US Flu VE Network
        • Hospitalized Adult Influenza Vaccine Effectiveness Network (HAIVEN)
      • How Vaccine Effectiveness and Efficacy are Measured
      • Why CDC Estimates Vaccine Effectiveness
      • Vaccine Effectiveness Studiesplus icon
        • 2018-2019 Vaccine Effectiveness
        • Past Seasons Vaccine Effectivenessplus icon
          • VE Tables for 2011-12
          • VE Tables for 2012-13
          • VE Tables for 2013-14
          • VE Tables for 2014-15
          • VE Tables for 2015-16
          • VE Tables for 2016-17
          • VE Tables for 2017-18
      • Flu Burden Averted from Vaccinationplus icon
        • How CDC Estimates Burden Averted
        • Why CDC Estimates Burden Averted
        • Past Seasons Burden Averted Estimatesplus icon
          • 2017-2018 Season Burden Estimates
          • 2016-2017 Season Burden Estimates
          • 2015-2016 Season Burden Estimates
          • 2014-2015 Season Burden Estimates
    • Symptoms & Diagnosis plus icon
      • Flu Symptoms & Complicationsplus icon
        • What People with a Staph Infection Should Know about Flu
      • The Difference Between Cold and Flu
      • Diagnosis
    • Treatmentplus icon
      • What You Need to Know
      • What are Flu Antiviral Drugsplus icon
        • Antiviral Drug Resistance
        • Baloxavir Marboxil
      • What to do if You Get Sick
      • Caring for Someone Sick
    • Schools, Businesses & Travelersplus icon
      • Schools & Childcare Providersplus icon
        • Guidance for School Administrators
        • Cleaning & Disinfecting Schools
        • School-Located Vaccination
      • Business & Employersplus icon
        • Prevent Flu in the Workplace
        • Promoting Vaccination in the Workplace
        • Resources for Hosting a Vaccination Clinic
        • Stay Home When Sick
      • Travelers
    • Flu Activity & Surveillanceplus icon
      • CDC’s WHO Collaborating Center
      • Overview of Influenza Surveillance in the United States
      • Current United States Flu Activity Map
      • Weekly U.S. Influenza Surveillance Report (FluView)
      • FluView Interactive
      • Past Weekly Surveillance Reports
      • FluSight: Flu Forecastingplus icon
        • About CDC’s Flu Forecasting Efforts
        • How CDC Uses Flu Forecasting
        • Why CDC Supports Flu Forecasting
        • Past Flu Seasons Flu Forecasting Accuracy Results
    • Health Professionalsplus icon
      • Health Care Workers Need A Flu Vaccine
      • ACIP Recommendationsplus icon
        • 2019-20 ACIP Background
        • Background and Epidemiology
        • 2019-20 ACIP Summary
      • Vaccinationplus icon
        • Flu Vaccination & Miscarriage
        • Table of Approved Vaccines for 2019-2020
        • Vaccine Dosage & Administration
        • For Clinicians: Vaccination Summary
        • For Clinicians: Vaccine Safety
        • Large-Scale Influenza Vaccination Clinic Planning
        • Reallocating Influenza Vaccine
        • Vaccination Settings
        • Make a Strong Flu Vaccine Recommendation
        • Tools to Prepare Your Practice for Flu Season
        • Sample Social Media Posts
      • Information for Clinicians on Influenza Virus Testingplus icon
        • Overview of Influenza Testing Methods
        • Information on Collection of Respiratory Specimens for Influenza Virus Testing
        • Clinical Signs & Symptoms of Influenza
        • Symptoms & Laboratory Diagnosis
        • Information for Clinicians on Rapid Diagnostic Testing for Influenza
        • Rapid Influenza Diagnostic Tests (RIDTs)
        • Guidance: Use of Rapid Diagnostic Test
        • Information on Rapid Molecular Assays, RT-PCR, and other Molecular Assays for Diagnosis of Influenza Virus Infection
        • Nucleic Acid Detection Based Tests
        • Medical Office Telephone Evaluation
        • Parotitis and Influenza
        • FAQ Parotitis and Influenza
        • Algorithm: Interpreting Influenza Testing Results When Influenza is Circulating
        • Algorithm: Interpreting Influenza Testing Results When Influenza is NOT Circulating
        • Guide: Considering Influenza Testing
        • Guide: Influenza Diagnostic Testing in Closed Setting Outbreaks
      • Information for Laboratoriesplus icon
        • Rapid Diagnostic Testing
        • Guidance: Standard-Based Electronic Laboratory Reporting
        • Influenza Virus Testing Methods
      • Antiviral Drugsplus icon
        • For Clinicians: Antiviral Medication
        • Types of Antiviral Drugs
        • Antiviral Guidance Reference Material
        • Guidance: Antiviral and Obstetric Health Care
        • Antiviral Drug Supply
      • Infection Controlplus icon
        • Guidelines for Healthcare Settings
        • Respiratory Infection Control Measures
        • Guidance: Outbreak Management in Long-Term Care Facilities
        • Guidance: Use of Mask to Control Influenza Transmission
        • Guidance: Prevention & Control in Peri- and Postpartum Settings
      • Toolkit for Long-Term Care Employers
      • Trainings
      • Health Professional References & Resources
    • Flu News & Spotlightsplus icon
      • 2018-2019
      • 2017-2018
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      • 2015-2016
      • 2014-2015
      • 2013-2014
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      • 2010-2011
      • 2009-2010
    • What’s New
    What CDC Does
    • FluVaxView
    • Communications Resource Center
    • International Work
    • Outbreak Investigations
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