Welcome to the healthchannels forum. Registration is simple and free. After registering you may join in the discussion and exchange comments with others who have similar health concerns. New to forums? Learn More Before Getting Started Flu (Influenza)
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Overview
Overview Flu is an acute illness (i.e., comes on suddenly) caused by infection with an influenza virus. The flu affects the upper and lower respiratory tract (e.g., nose, throat, bronchi, lungs) and also causes symptoms that affect the entire body (i.e., systemic symptoms), such as headache, fever, muscle aches (myalgia), and weakness. Infection with the flu virus usually lasts about one week. In April 2009, the World Health Organization (WHO) raised the pandemic alert to phase 5 in resp...Read the full article 
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