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Usually ILI increases first, followed by an increase in flu-associated hospitalizations, which is then followed by increases in flu-associated deaths. The timing of flu is unpredictable and can vary in different parts of the country and from season to season.
For the most current influenza surveillance information: Weekly U. Seasonal flu viruses can be detected year-round; however, seasonal flu activity often begins as early as October and November and can continue to occur as late as May.
More information regarding these Preliminary In-Season Burden Estimates is available.
For more information on CDC surveillance systems, see CDC’s Overview of Influenza Surveillance in the United States.
The United States experiences annual epidemics of seasonal flu.
CDC does not know exactly how many people get sick with seasonal flu each year.
More information on these estimates is available on CDC’s Disease Burden of Influenza page.