Inhaled Mesenchymal Stem Cell-Derived Exosomes(Shanghai Changzheng Hospital)

This study is an exploratory clinical trial. It is intended to investigate the efficacy of mesenchymal stem cell-derived exosome nebulization in the treatment of postinfectious cough through a randomized controlled clinical study, with a view to providing better treatment options for patients with postinfectious cough, improving their quality of life, and providing reference data for the subsequent multi-center clinical trials.