Upper respiratory tract infection overview

Upper respiratory tract infection Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Upper respiratory infections, commonly referred to the acronym URI or URTI, is the illness caused by an acute infection which involves the upper respiratory tract: nose, sinuses, pharynx or larynx. In the United States, this represents approximately one billion acute upper respiratory illnesses annually.