IL4 and infection: IFN-γ is mainly produced by Th1 cells and is involved in regulating the immune function of the body after infection, and can mediate the production of other inflammatory mediators.25 Budesonide suspension combined with bronchofiberscopic lavage has been touted for various benefits, such as blocking the release of inflammatory mediators and cytokines, significantly reducing serum IL-6, IL-4, and IFN-γ levels in children with RMPP, diminishing airway inflammation caused by abnormal immune responses, and improving respiratory symptoms in children.