Although they can also participate in the pathogenesis of asthma through the Th2 cells pathway, which is not specific to ILC2 cells, this study found that the ILC2 specific transcription factors RORα and GATA-3 in the bronchiolitis group were significantly higher than the control group, indicating that ILC2 has been polarized. The gene discussed is RORA; the disease is bronchiolitis.