While seasonal influenza (flu) viruses are detected year-round in the United States, flu viruses are most common during the fall and winter. The exact timing and duration of flu seasons vary, but influenza activity often begins to increase in October. Most of the time flu activity peaks between December and February, although significant activity can last as late as May.
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The Centers for Disease Control and Prevention says the flu virus and COVID-19 will spread this fall and winter.