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A Respiratory Infection 

A Respiratory Infection
A Respiratory Infection

Kelly A. Cawcutt

and Cassie C. Kennedy

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date: 16 January 2021

Influenza results from 3 species of RNA viruses that cause clinical illness: influenza A virus, influenza B virus, and influenza C virus. Influenza C virus causes a mild illness that does not require treatment and is therefore rarely discussed as being clinically relevant. Influenza A virus and influenza B virus form the seasonal influenza strains that are the focus of the guidelines for prevention, diagnosis, and treatment of influenza.

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