The flu is caused by the influenza virus. Doctors classify the virus as influenza type A and type B, each of which includes several subtypes or strains. These strains are different from the original virus but retain some of its ch
Anyone exposed to an influenza (flu) virus can become infected. These viruses are contagious and spread easily among people in groups, such as in nursing homes, hospitals, shelters, schools, and day cares. Working, visiting, or li
Cough and cold medicines aren't recommended for children. A Mayo Clinic specialist explains why.
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The flu is often confused with the common cold. Flu symptoms are usually more severe and appear suddenly.
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