COVID-19(15) Coronavirus disease 2019(10) airway(9) Clinical severity(6) Corticosteroid(6) hypersensitivity reactions(6) Corticosteroids(6) anaphylaxis(6) cell activation(6) pulmonary(6) detect(6) severe COVID-19.(6) Severity Score(6) correlated(6) AhR(6) pulse methylprednisolone therapy(6) hypersensitivity(6) coronavirus disease(6) S1 protein(6) severe COVID-19(6) positive(6) nucleocapsid protein(6) IgE(6) analysed(6) Early convalescence(6) PaO(6) Anti-SARS-CoV-2 specific IgE antibodies(6) Evidence(6) provocation test(6) Pathogenesis(6)