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Patients with eosinophilic esophagitis (EoE) and extremely high esophageal eosinophilia have a distinct endotype defined by more severe atopic, endoscopic, histologic, and transcriptomic features.Background Asthma is a complex heterogeneous disease occurring in adults and children that is characterized by distinct inflammatory patterns. While numerous studies have been performed in adults, little is known regarding the heterogeneity of severe asthma in children, particularly inflammatory signatures involving the air spaces. Objective To determine the relati