Over the course of a flu season, different types and subtypes of influenza can cause illness in humans. There are four types of influenza virus such as A, B, C, and D. Influenza A and B virus causes most of the illness in humans. Prolonged influenza infections can cause severe complications such as pneumonia, bronchitis, acute respiratory distress, secondary bacterial infections, and cardiovascular complications. To control the illness caused by influenza virus, influenza antiviral prescription drugs can be used.
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