Illustration of the respiratory tract and the influenza virus

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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Results 1 - 10 of 2,216 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. Flu Shot (National Library of Medicine)  
    Flu is a respiratory infection caused by a number of viruses. Most people with the flu get better on their own. But it can ... cause complications and sometimes even death. Getting the flu vaccine every year is the best way to ...
  5. 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 ...
  6. Swine flu; H1N1 type A influenza ... quickly around the world. During the 2010-2010 flu season, the H1N1 virus has not caused widespread ...
  7. 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) ...
  8. 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 ...
  9. Flu 
    Influenza A; Influenza B ... The flu is caused by an influenza virus. Most people get the flu when they breathe in tiny airborne droplets from the coughs or sneezes of someone who has ...
  10. Bird flu; H5N1; H5N2; H5N8; H7N9; Avian influenza A (HPAI) H5 ... The first avian influenza in humans was reported in Hong Kong in 1997. It was called avian influenza (H5N1). The outbreak was linked ...
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