Flu season in the United States typically runs during the fall and winter months, peaking between December and February. While influenza viruses circulate year-round, the majority of flu activity and its associated health impacts (infections, hospitalizations, and deaths) are concentrated within this period.
Understanding Flu Season
The timing of flu season is consistent across numerous reputable sources including the CDC (https://www.cdc.gov/flu/about/season.html) and state health departments like the Illinois Department of Public Health (https://www.illinois.gov/news/press-release.18183.html). The World Health Organization (https://www.who.int/news-room/fact-sheets/detail/influenza-(seasonal)) also confirms the seasonal nature of influenza outbreaks.
Several factors contribute to the seasonal pattern:
- Increased indoor gatherings: People spend more time indoors during colder months, facilitating the spread of respiratory viruses.
- Lower humidity: Dry air can damage the mucous membranes of the respiratory tract, making individuals more susceptible to infection.
- Virus survival: Influenza viruses survive longer in colder, drier conditions.
Key Flu Season Information
- Peak Activity: December to February
- Prevention: Vaccination is the most effective preventative measure. The nasal spray vaccine is now a recommended option. (https://www.illinois.gov/news/press-release.18183.html)
- Symptoms: Fever, cough, sore throat, body aches, and runny nose are common symptoms. (https://www.who.int/news-room/fact-sheets/detail/influenza-(seasonal))
