Question

Definition of upper respiratory tract infection diagramn

Answer 1

Upper respiratory tract infections (URI or URTI) are illnesses caused by an acute infection which involves the upper respiratory tract including the nose, sinuses, pharynx 
or larynx. This commonly includes nasal obstruction, sore throat, tonsillitis, pharyngitis, laryngitis, sinusitis, otitis media, and the common cold.Most infections are viral in nature and in other instances the cause is bacterial.