Flu activity peak months in the United States from the 1982 to 1983 through 2021 to 2022 flu seasons^*

* There was no discernible peak in activity during the 2020 to 2021 season due to the uncharacteristically low level of influenza virus circulation that season.

Reproduced from: Influenza (Flu): When Is Flu Season. Centers for Disease Control and Prevention. www.cdc.gov/flu/about/season/index.html (Accessed on November 17, 2023).

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