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What virus causes influenza?

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Causes. The main three types of influenza virus are named A, B, and C. A and B viruses cause seasonal epidemics of disease almost every winter in the United States while C causes only mild respiratory symptoms, according to the Centers for Disease Control and Prevention (CDC). read more

Most experts believe that flu viruses spread mainly by tiny droplets made when people with flu cough, sneeze or talk. These droplets can land in the mouths or noses of people who are nearby. Less often, a person might also get flu by touching a surface or object that has flu virus on it and then touching their own mouth, nose, or possibly their eyes. read more

While more than 100 different viruses can cause a cold, only influenza virus types A, B, and C cause the flu. Type A and B viruses cause the large seasonal outbreaks. Type C usually causes milder respiratory symptoms. read more

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