Flu Season Peak Months: What You Need to Know About Timing and Prevention
Influenza (flu) is a respiratory virus that can occur year-round, but flu season typically runs from October through May in the United States, with peak activity between December and February. Approximately 8% of Americans get sick during each flu season.
Person sneezing into elbow
Why Flu Peaks in Winter
- Cold temperatures help viruses spread more efficiently
- People spend more time indoors, increasing transmission
- Regional variations affect timing and severity
Global Flu Patterns
- Northern Hemisphere: October to May
- Southern Hemisphere: April to September
- Peak months vary by location and year
High-Risk Groups
- Young children under 5
- Adults 65 and older
- Pregnant women
- People with chronic health conditions
- Those with weakened immune systems
Prevention Methods
- Get annual flu vaccine (ideally in September or October)
- Wash hands frequently with soap and water
- Avoid close contact with sick people
- Cover coughs and sneezes
- Clean frequently touched surfaces
- Stay home when sick
Other Seasonal Illnesses Several respiratory infections commonly circulate during flu season:
- Common cold
- COVID-19
- Bronchitis
- Pneumonia
- Respiratory syncytial virus (RSV)
When to Get Vaccinated
- Best time: September-October
- Still beneficial through January or later
- Protection lasts throughout the flu season
- Annual vaccination recommended for everyone 6 months and older
Getting your annual flu shot remains one of the most effective ways to prevent infection and reduce severity if you do get sick. While the timing of flu season is predictable, the severity varies year to year, making prevention crucial for public health.
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