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en.wikipedia.org/wiki/Influenza

Influenza, commonly known as "the flu", is an infectious disease caused by an influenza virus. Symptoms can be mild to severe. The most common symptoms ...

www.cdc.gov/flu/keyfacts.htm

Aug 25, 2016 ... The flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. It can cause mild to severe illness, ...

www.cdc.gov/flu/index.htm

Weekly U.S. Influenza Surveillance Report Friday, September 22, 2017 ... Lineage Avian Influenza A(H7N9) Viruses During the Fifth Epidemic - China, October 1 ...

www.medicalnewstoday.com/articles/15107.php

Jul 14, 2017 ... Flu, also known as influenza, is a respiratory illness caused by a virus. Influenza is highly contagious and life-threatening for some population ...

medlineplus.gov/flu.html

Jun 28, 2017 ... Do you know the difference between a cold and the flu (influenza)? Or looking for information on the "stomach flu?" Discover symptoms and ...

www.who.int/mediacentre/factsheets/fs211/en

WHO fact sheet on influenza: includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, WHO response.

www.verywell.com/what-is-influenza-a-770484

Aug 17, 2017 ... The flu is a highly contagious and common illness that is caused by the influenza virus. There are three different types of flu viruses: influenza A ...

www.nfid.org/influenza

Influenza, more commonly referred to as "flu," impacts people of all ages. Influenza is a highly contagious viral infection of the nose, throat, and lungs that occurs ...

www.webmd.com/cold-and-flu/tc/influenza-topic-overview

Influenza (flu) is an illness caused by a virus that comes on suddenly, and causes symptoms such as fever, body aches, headache, fatigue, loss of appetite, a dry ...