2023-2024 United States Flu Season: Preliminary In-Season Severity Assessment | CDC – CDC

CDC classifies severity to understand the impact of flu virus activity throughout the season on the population and health care system. These data can help guide public health actions, such as targeting prevention and treatment messages to appropriate audiences and make recommendations designed to prevent flu illnesses and death. Additional information onHow CDC Classifies Flu Severityis available.

Additionally, CDC estimates the 2023-2024 in-season disease burden of flu available at Preliminary In-Season Burden Estimates.

Three flu surveillance indicators (influenza-like illness (ILI) outpatient visits, flu-related hospitalizations, and flu deaths) are used to assess the severity of a flu season each week. The preliminary severity for a season is classified by assessing these indicators across all age groups at the highest week of activity for each indicator during the season. The highest values are compared to historic flu seasons and classified as being low, moderate, high, or very high severity based on which intensity threshold the highest week value observed to date crosses. The highest week assessment can change as the season progresses, depending on activity levels of the flu indicators.

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2023-2024 United States Flu Season: Preliminary In-Season Severity Assessment | CDC - CDC

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