gram-positive_bacterial_infectious_disease obsolete diphtheritic laryngotracheitis true disease_ontology DOID:11404 A diphtheria that involves a bluish white membrane formation on the larynx. It can be an extension of the nasopharyngeal diphtheria. This membrane can lead to airway obstruction, coma, and death. Symptoms include fever, hoarseness, and a barking cough. laryngeal Diphtheria laryngeal diphtheria laryngeal diphtheria (disorder)