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In case of an emergency from upper airway obstruction, urgent insertion of primitive airway equipment, such as a small pharyngeal tube, was applied. Conclusions The main Hippocratic concepts on four still common acute and urgent respiratory diseases -pneumonia, pleurisy, thoracic empyema and upper airway obstruction- were identified and most of them were found to be in agreement with contemporary medical thinking and practice.Background Tolerogenic vaccines represent antigen-specific interventions designed to re-establish self-tolerance a