Influenza Fact Sheet

Influenza, commonly known as the flu, is a contagious viral infection that spreads through respiratory droplets when people cough, sneeze, or talk. It can cause mild to severe illness and may lead to complications such as ear and sinus infections, bronchitis, pneumonia, dehydration, and worsening of chronic medical conditions like asthma, diabetes, or heart disease. In severe cases, the flu can be fatal.

Why Get a Flu Vaccine Every Year?

Flu viruses evolve constantly, which is why the flu vaccine is updated each year to protect against the most recent strains. Additionally, the immunity provided by the vaccine declines over time, so annual vaccination is recommended to maintain optimal protection.

Who Should Get the Flu Vaccine?

The Missouri Department of Health and Senior Services recommends annual flu vaccinations for everyone aged six months and older, unless there is a specific medical reason not to. It is especially crucial for:

• Young children
• Pregnant women
• Older adults
• Individuals with chronic health conditions

Protect yourself and those around you by getting vaccinated every year.

Can I Get the Flu From the Vaccine?

No, the flu vaccine cannot give you the flu. The most common side effect is mild soreness in the arm where the vaccine was administered. Full protection from the flu develops about two weeks after receiving the vaccine.

If I Had the Flu This Season, Am I Protected for the Rest of the Year?

Not necessarily. While recovering from one strain of the flu may provide immunity to that specific virus, it doesn’t guarantee protection against other strains circulating in the same season. Vaccination remains the best defense.

How Long Can I Spread the Flu to Others?

Most healthy adults can spread the flu to others starting one day before symptoms appear and up to seven days after falling ill. Children and individuals with weakened immune systems may remain contagious for even longer periods.

What Can I Do to Protect Myself From Getting the Flu?

Here are some effective ways to reduce your risk:

• Get vaccinated annually
• Wash your hands frequently with soap and water
• Stay home if you're feeling unwell to prevent spreading illness
• Avoid touching your eyes, nose, and mouth
• Avoid close contact with people who are sick
• Cover your mouth and nose when you cough or sneeze

By taking these steps, you can protect yourself and help prevent the spread of influenza in your community. For more information, contact your local health department. 

Additional Resources