What Is Influenza?
5. What Is the Flu Season?
The flu dramatically increases in activity in the fall and winter months in the United States, creating an annual flu season. From October to May, particularly from December to February, the cases of influenza are dramatically higher than other times of the year.
Fall and winter is a common time for respiratory viruses and bacteria to spread. The common cold and other pathogens are typically present in this season as well, so it isn’t always clear whether an individual has the flu or another respiratory illness. Knowing about the flu season gives you an opportunity to protect yourself from the flu and the risk of complications.
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