This persistent cough following a severe upper respiratory viral infection is most likely to be due to an ongoing infection of his trachea called tracheitis. The cough often lasts as long as 6 weeks. Cough mixtures have little effect on this cough which can be very troublesome as you are experiencing with your son. In some cases it is necessary to give a short course of a mild cortisone by mouth such as Prelone syrup for a 5 day course.
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