Inhaled Mesenchymal Stem Cell-Derived Exosomes in the Treatment of Post-Infectious Cough: A Single-Center Randomized Controlled Clinical Trial

Exclusion Criteria

• •1. patients with any other disease that causes coughing (eg, Upper airway cough syndrome, eosinophilic bronchitis, gastroesophageal reflux cough, bronchial asthma, chronic obstructive pulmonary disease and bronchiectasis).
• •2. Patients with serious lung diseases (eg, lung cancer, tuberculosis or pulmonary fibrosis).
• •3. Patients with serious comorbidities, (eg, cardiovascular, cerebrovascular, liver, kidney or hematopoietic system diseases or other serious primary diseases)
• •4. Current or ex-smokers quitting smoking for less than 6 months.
• •5. Patients with a body temperature ≥37.3℃.
• •6. Patients with white blood cell count or neutrophil count is higher than the upper limit of normal.
• •7. Patients with abnormal chest X-rays.
• •8. Patients Suspected or confirmed history of alcohol or drug abuse or mental illness.
• •9. Patients with pregnancy, lactation or planning pregnancy.