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Influenza, or "flu," is a contagious respiratory infection caused by several flu viruses. It may look like the common cold because it infects the same organs (nose, throat, lungs) and has similar symptoms. Influenza can cause mild to severe illness, and at times it can lead to death.



Flu: Understanding Influenza Virus This module, designed for health care workers and other health professionals, offers a detailed examination of the three flu virus types that causes the flu. It looks at such issues as virus structure, antigenic drift, antigenic shifting, then compares seasonal and pandemic influenza. The module offers additional resources for further study.


For General Audiences

Flu (influenza) The World Health Organization each year reports that millions of people worldwide contract the flu virus, and many die from it. This module describes influenza (the flu), discusses who is at highest risk, how to prevent it and how to treat it.