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The Library Springfield-Greene County Library District Springfield, Missouri
Health & Wellness, Science

Seasonal Influenza


What is the flu?

The flu, or influenza, is caused by a virus. When the virus enters a human body it attaches to a host cell and uses the genetic material found there to replicate itself. The new particles detach from the host cell and quickly attack other cells. Bodily fluids such as mucus and saliva harbor these virus particles. When a person coughs or sneezes they release a spray of virus particles waiting to infect the next host cell they contact.


How do flu vaccines work?

The flu vaccine consists of an influenza virus grown in a chicken egg, extracted and then chemically treated to render it non-infective. Once administered (by injection or nasal-spray), it causes the immune system to develop antibodies against influenza virus particles. When the body is then exposed to the actual virus, the body has the necessary protections already in place.

At any given time, multiple strains of the flu virus may be circulating. The effectiveness of the flu vaccine depends in part upon the similarity of the viruses included in the vaccine to the viruses currently circulating in the population. Because of this, three kinds of flu virus are used to produce each year’s vaccine.


Want to know more?

The Centers for Disease Control and Prevention offer a wealth of information for those interested in learning more about the virus strains selected for vaccines and the strains anticipated to cause illness each flu season.  Both the CDC and monitor seasonal flu activity and provide up-to-date news and statistics.

The Springfield-Greene County Health Department provides a listing of area flu clinics operating in the area as well as general information about flu vaccination.

If you're interested in following the spread of the flu this season, check out Google Flu Trends or Flu Near You for reports of flu activity nationwide. 

To learn more about viruses, check out the following titles from your local branch of the Springfield-Greene County Library:


 Wash your hands!: The Dirty Truth About Germs, Viruses, and Epidemics-- and the Simple Ways to Protect Yourself in a Dangerous World by Frédéric Saldmann




 The Five-Second Rule and Other Myths About Germs: What Everyone Should Know About Bacteria, Viruses, Mold, and Mildew by Anne E. Maczulak




 The Viral Storm: The Dawn of a New Pandemic Age by Nathan Wolfe





 A Planet of Viruses by Carl Zimmer

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