ABPA allergic bronchopulmonary aspergillosis AEP acute eosinophilic pneumonia ANCA antineutrophil cytoplasmic antibody BAL bronchoalveolar lavage CEP chronic eosinophilic pneumonia CLC Charcot-Leyden crystal COVID-19 coronavirus disease 2019 CRS chronic rhinosinusitis CRSwNP CRS with nasal polyps CT computed tomography ECP eosinophil cationic protein EDN eosinophil-derived neurotoxin EET eosinophil extracellular trap EGPA eosinophilic granulomatosis with polyangiitis EPX eosinophil peroxidase FENO exhaled nitric oxide fraction GM-CSF granulocyte–macrophage colony-stimulating factor HES hypereosinophilic syndrome ICAM intracellular adhesion molecule ICS inhaled corticosteroid IFN interferon Ig immunoglobulin IL interleukin ILC2 type 2 innate lymphoid cell MBP major basic protein MHC major histocompatibility complex OCS oral corticosteroid TGF transforming growth factor TNF tumour necrosis factor TSLP thymic stromal lymphopoietin VCAM vascular cell adhesion molecule List of abbreviations