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Number of influenza cases during the 2017-2018 flu season in the U.S. by age group

The CDC estimated that those aged 18 to 49 accounted for the highest number of symptomatic cases of influenza during the 2017 to 2018 flu season. This statistic shows the estimated number of symptomatic influenza cases in the U.S. during the 2017-2018 influenza season, by age group.

Number of symptomatic influenza cases during the 2017-2018 influenza season in the United States, by age group*

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Release date

November 2019


United States

Survey time period


Supplementary notes

* The CDC use a mathematical model to estimate the numbers of influenza illnesses, medical visits, hospitalizations and deaths to inform policy and communications related to influenza prevention and control. Current preliminary estimates for 2017-2018 are based on data from 2010 to 2017.

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Statistics on "Influenza in the U.S."

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