title: The definition of acute respiratory illnesses in children.
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012140:Respiratory Tract Diseases / Q000145:classification* / Q000175:diagnosis