Influenza is the acute viral infection of the upper and lower respiratory tract. It is also referred to as flu which is characterized by fever, chills, headache, sore throat, runny nose, generalized weakness and pain in muscles. Influenza is classified into three main groups, namely A, B, and C.

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Chapter 26, Problem 2A

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Introduction: Influenza is the acute viral infection of the upper and lower respiratory tract. It is also referred to as flu which is characterized by fever, chills, headache, sore throat, runny nose, generalized weakness and pain in muscles. Influenza is classified into three main groups, namely A, B, and C.

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