Inclusion Criteria:  Written informed consent consistent with ICH-GCP and local laws, signed prior to any study procedures being performed Age >18 years A clinical diagnosis of ILD with accepted specific diagnoses including: Idiopathic pulmonary fibrosis (IPF) Chronic hypersensitivity pneumonitis associated ILD (CHP-ILD) Connective tissue disease associated ILD (CTD-ILD) Pneumoconiosis Daily Cough for at least 8 weeks Able to produce an adequate sample with sputum induction  Exclusion Criteria:  Patients with a diagnosis of systemic sclerosis associated ILD (SSc-ILD) or sarcoidosis Cause of cough attributed to a known etiology (ex. ACE-inhibitor, uncontrolled gastroesophageal reflux or upper airway cough syndrome, acute viral illness) Current use of inhaled corticosteroids Current use of systemic corticosteroids (prednisone equivalent > 20mg/day) Current use of chronic antibiotics Airflow obstruction (ie. pre-bronchodilator FEV1/FVC ratio < 0.7) History of physician-diagnosed asthma History of emphysema A history of cholestatic jaundice or hepatic dysfunction associated with prior use of azithromycin Moderate to severe hepatic dysfunction with a Child Pugh score >10 Known allergy or hypersensitivity to inhaled corticosteroids or macrolide antibiotics Corrected QT-interval (QTc) on screening electrocardiogram (ECG) of > 450ms An established history of untreated atypical mycobacterial infection A history of hearing impairment, tinnitus, or vertigo Medication use likely to suppress cough (ex: morphine, gabapentin, amitriptyline)