Weekly U.S. Influenza Surveillance Report

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CDC Publishes First Preliminary In-Season Flu Burden Estimates for 2023-2024

November 17, 2023

	Influenza (Flu) 2023 - 2024 Flu Season

www.cdc.gov/flu

Weekly U.S. Influenza Surveillance Report Seasonal flu activity continues to increase in most parts of the country, most noticeably in the South Central, Southeast, and West Coast regions. Flu hospitalizations also have increased nationally. Everyone 6 months of age and older should get an annual flu vaccine now to protect themselves from flu this season.

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CDC Publishes First Preliminary In-Season Flu Burden Estimates CDC posted its first preliminary in-season flu burden estimates for the U.S. on Nov. 10. CDC estimates that from Oct. 1, 2023, through Nov. 11, 2023, there were between 780,000 -1.6 million flu illnesses, 360,000-770,000 flu-related medical visits, 8,000 to 17,000 flu-related hospitalizations, and 490-1,500 flu-related deaths. Estimates are based on Influenza Hospitalization Surveillance Network data.   Learn More

B/Yamagata  Flu vaccines will undergo a change in the future. Regulatory agencies have recommended that B/Yamagata lineage vaccine viruses be removed from flu vaccines in the future because these viruses have not been detected and, as a result, no human infections with it have been identified since March 2020. That means flu vaccines would go back to being trivalent, protecting against three different flu viruses.  Learn More

	Twitter @CDCFlu The best way to reduce the risk of potentially serious #flu outcomes, such as hospitalization, is a yearly flu vaccination. Let your community know to get a flu vaccine https://bit.ly/3QoYvvz #FightFlu

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