Influenza: Influenza is an acute respiratory illness caused by influenza A or B viruses Most people who get the influenza recover completely in 1 to 2 weeks, but some people develop serious and potentially life-threatening medical complications, such as pneumonia. Much of the illness and death caused by influenza can be prevented by annual influenza vaccination.
QUESTION
Which illness is known as a viral upper respiratory tract infection? See AnswerFrom 
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Reviewed on 12/12/2018