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For 2018-2019, trivalent (three-component) vaccines are recommended to contain: You should get a flu vaccine before flu begins spreading in your community.
It takes about two weeks after vaccination for antibodies that protect against flu to develop in the body, so make plans to get vaccinated early in fall, before flu season begins.
The United States experiences annual epidemics of seasonal flu.
This time of year is called “flu season.” In the United States, flu viruses are most common during the fall and winter months.
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.
Influenza activity often begins to increase in October and November.
Most of the time flu activity peaks between December and February, and it can last as late as May.
Getting vaccinated later, however, can still be beneficial and vaccination should continue to be offered throughout flu season, even into January or later.CDC monitors certain key flu indicators (for example, outpatient visits of influenza-like illness (ILI), the results of laboratory testing and reports of flu hospitalizations and deaths).