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  • Key Facts About Influenza (Flu)| Seasonal Influenza (Flu) | CDC

    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, ...

  • Influenza (Flu) | CDC

    There are many different influenza A viruses; some are found in humans and
    others in animals such as avian flu in birds and poultry. Avian influenza A viruses

  • Influenza - Wikipedia

    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 ...

  • Influenza (flu) Overview - Mayo Clinic

    Oct 20, 2016 ... Influenza is a viral infection that attacks your respiratory system — your nose,
    throat and lungs. Influenza, commonly called the flu, is not the ...

  • Influenza (Flu) - National Foundation for Infectious Diseases

    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 ...

  • WHO | Influenza (Seasonal)

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

  • Influenza (Seasonal Flu)-Topic Overview - WebMD

    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 ...

  • Flu: Symptoms, treatment, and prevention - Medical News Today

    Jul 22, 2016 ... 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 ...

  • Flu | Flu Symptoms | Stomach Flu | Influenza | MedlinePlus

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

  • Influenza: Practice Essentials, Background, Pathophysiology

    Nov 22, 2016 ... Influenza, one of the most common infectious diseases, is a highly contagious
    airborne disease that occurs in seasonal epidemics and ...