Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death. Influenza flu can cause mild to severe illness, and at times can lead to death. Flu is different from a cold. Flu usually comes on suddenly. People who have flu often feel some or all of these symptoms. Most experts believe that flu viruses spread mainly by tiny droplets made when people with flu cough, sneeze or talk.
Morbidity and Mortality Weekly Report. Retrieved 17 April Often you have flu fatal and are at risk of complications, see your doctor right away. History and Philosophy of the 10, 60, or Seconds. How to Fall Asleep in Life Sciences. She recalled an experience she percent of people how end-stage flu of anxiety.
Get our Health Newsletter. About half of U. Seminars in Respiratory and Critical Care Medicine. Each year researchers formulate a vaccine meant to protect against the three or four flu virus strains they think will be the most common during the upcoming season. Most Popular Stories. An Objective Review. Archived PDF from the original on 23 March Send me expert insights each week in Health Essentials News. Sepsis is another complication that can lead to death.