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About the Flu

Flu refers to illnesses caused by a number of different influenza viruses. Flu can cause a range of symptoms and effects, from mild to lethal. Learn more about the various types of flu below.

Pandemic Flu
Pandemic flu is a global outbreak of disease that occurs when a new influenza A virus appears or “emerges” in the human population, causes serious illness and then spreads easily from person to person worldwide. Pandemic H1N1 2009 was our most recent flu pandemic. Avian flu is another virus that has been a concern in recent years.Learn more here.

H1N1 Flu
2009 H1N1 (sometimes called “swine flu”) is a new influenza virus causing illness in people. This new virus was first detected in the United States population in April 2009. This virus is spreading from person-to-person worldwide, in much the same way that regular seasonal influenza viruses spread. Learn more here.

Seasonal Flu
Influenza (the flu) is a contagious respiratory illness caused by influenza viruses. It spreads from person-to-person and can cause mild to severe illness; and in some cases, can lead to death. Learn more here.

Avian Flu
Avian (H5N1) flu virus is an influenza A virus subtype that is highly contagious among birds, and can be deadly to them. Avian flu virus does not usually infect people, but rare infections with these viruses have occurred in humans. Nearly all human cases have resulted from people having direct or close contact with H5N1-infected poultry or H5N1-contaminated surfaces. Learn more here.

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