id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-022156-mm8en4os	Isaiah, Amal	Tracheal Infections	2015-07-14		.txt	text/plain	5725	295	44	Tracheal infections have a signifi cantly lower incidence compared to infections of the upper respiratory tract, with 1-5 % of all children requiring outpatient evaluation for viral croup within the fi rst 3 years of life. In 1958, the fi rst evidence for association between croup and two newly isolated myxoviruses, parainfl uenza virus types 1 and 2, resulted in separation of two categories of cases-mild, requiring only outpatient follow up, and severe, requiring hospitalization [ 12 ] . Among other important viral pathogens causing tracheal infections, RSV was studied in isolates from sentinel practices in England and Wales from 1975 to 1990, during which an increase in mortality, by as much as 60-80 %, was observed in comparison with parainfl uenza and infl uenza viruses [ 13 ] . [ 31 ] studied the clinical courses of croup caused by parainfl uenza and infl uenza viruses to highlight the differences in morbidity caused by the different viral strains in hospitalized children.	./cache/cord-022156-mm8en4os.txt	./txt/cord-022156-mm8en4os.txt