U.S. Influenza Surveillance System: Purpose and Methods

Due to the ongoing COVID-19 pandemic, this system will suspend data collection for the 2020-21 influenza season. Data from previous seasons are available on FluView Interactive.”

https://www.cdc.gov/flu/weekly/overview.htm

https://web.archive.org/web/20201101121345/https://www.cdc.gov/flu/weekly/overview.htm