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Flu is a respiratory infection caused by a number of viruses. The viruses pass through the air and enter your body through your nose or mouth. Between 5% and 20% of people in the U.S. get the flu each year. The flu can be serious or even deadly for elderly people, newborn babies, and people with certain chronic illnesses.

Symptoms of the flu come on suddenly and are worse than those of the common cold. They may include

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Illustration of the respiratory tract and the influenza virus
Results 1 - 10 of 3,183 for influenza
  1. Flu (National Library of Medicine)  
    Flu is a respiratory infection caused by a number of viruses. The viruses pass through the air ... 20% of people in the U.S. get the flu each year. The flu can be serious or ...
  2. Bird Flu (National Library of Medicine)  
    Birds, just like people, get the flu. Bird flu viruses infect birds, including chickens, other poultry, and wild birds such as ducks. Most bird flu viruses can only infect ...
  3. H1N1 Flu (Swine Flu) (National Library of Medicine)  
    Swine flu is an infection caused by a virus. It's named for a virus that pigs can get. People do not normally get swine flu, but human infections can and do happen. In ...
  4. Gastroenteritis (National Library of Medicine)  
    Have you ever had the "stomach flu?" What you probably had was gastroenteritis - not a type of flu at all. Gastroenteritis is an inflammation of the lining of the ...
  5. Influenza Interactive Tutorial (Patient Education Institute)  
    Influenza - Flu Introduction Influenza, also known as the flu, is a contagious disease that is caused by the influenza ... diagnosis, treatment, and prevention of flu. What is Flu? The influenza virus causes flu. A virus is ...
  6. Vaccine - influenza; Immunization - influenza; Flu shot; Flu vaccine ... The flu is a respiratory disease that spreads easily. It is caused by an influenza virus. Thousands of people ...
  7. Swine flu; H1N1 type A influenza ... quickly around the world. During the 2010-2010 flu season, the H1N1 virus has not caused widespread ...
  8. Babies and the flu; Your infant and the flu; Your toddler and the flu ... FLU SYMPTOMS IN INFANTS AND TODDLERS The flu is an infection of the nose, throat, and (sometimes) ...
  9. Key Facts about Influenza (Flu) and Flu Vaccine (Centers for Disease Control and Prevention)  
    ... Seasonal Influenza (Flu) Share Compartir Key Facts about Influenza (Flu) & Flu Vaccine On this Page What is influenza (also ... not be vaccinated against seasonal flu? What is influenza (also called flu)? The flu is a contagious ...
  10. H1N1 and Seasonal Flu: The "New" Flu and the "Old" Flu (American Medical Association) - PDF  
    ADVICE FOR PATIENTS H1N1 and Seasonal Flu: The “New” Flu and the “Old” Flu T he flu (influenza) is a contagious respiratory illness caused by flu viruses. It can ...
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