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Definition and Causes. Upper respiratory tract infection (URI) is a nonspecific term used to describe acute infections involving the nose, paranasal sinuses, pharynx, larynx, trachea, and bronchi. The prototype is the illness known as the common cold, which is discussed here, in addition to pharyngitis, sinusitis, and tracheobronchitis.
The upper respiratory tract, can refer to the parts of the respiratory system lying above the sternal angle (outside of the thorax), above the glottis (vocal cords), or above the cricoid cartilage. So that the larynx is sometimes included in the upper airway and sometimes in the lower airway.he upper respiratory tract, can refer to the parts of the respiratory system lying above the sternal angle (outside of the thorax), above the glottis (vocal cords), or above the cricoid cartilage. So that the larynx is sometimes included in the upper airway and sometimes in the lower airway.