10 things to know about Influenza
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Influenza is an acute, contagious and usually self-limited febrile illness caused by infection of the respiratory tract with the influenza virus. The most common clinical manifestations are fever, malaise, and cough. The epidemic nature of influenza results in outbreaks every winter (seasonal influenza) but it is important to remember that the potential to become a pandemic always exists, as in the 2009 H1N1 influenza pandemic (this virus was a unique combination of influenza virus genes never previously identified in either animals or people).