Definition

• Influenza is an acute respiratory illness caused by infection with one of the influenza viruses.
• Influenza affects the upper and/or lower respiratory tract and often is accompanied by systemic signs and symptoms such as fever, headache, myalgia, and weakness.
• Outbreaks occur nearly every winter.
  • Significant morbidity in the general population
  • Increased mortality rates among certain high-risk groups, mainly as a result of pulmonary complications

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