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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

Oct 3, 2017 ... The flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to ...

www.cdc.gov/flu/index.htm

During week 44 (Oct 29-Nov 4, 2017), influenza activity remained ... During week 44, influenza activity remained low in the US, but is increasing.

medlineplus.gov/flu.html

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

www.medicalnewstoday.com/articles/15107.php

Jul 14, 2017 ... Influenza, or flu, is a respiratory illness caused by a virus. Flu is highly contagious and is normally spread by the coughs and sneezes of an ...

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.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.mayoclinic.org/diseases-conditions/flu/symptoms-causes/syc-20351719

Oct 5, 2017 ... Overview. Influenza is a viral infection that attacks your respiratory system — your nose, throat and lungs. Influenza, commonly called the flu, ...

www.webmd.com/cold-and-flu/flu-guide/advanced-reading-types-of-flu-viruses

Aug 24, 2017 ... Flu, or influenza, is a contagious respiratory infection caused by a variety of flu viruses. Symptoms of flu involve muscle aches and soreness, ...