Is commonly known as "the flu", is an infectious disease caused by an influenza virus. It is highly contagious viral infection of the respiratory passages causing fever, severe aching, and catarrh, and often occurring in epidemics.
Is commonly known as "the flu", is an infectious disease caused by an influenza virus. It is highly contagious viral infection of the respiratory passages causing fever, severe aching, and catarrh, and often occurring in epidemics.
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