IGHE and bronchitis: In this retrospective study of 125 CwCF with a positive Asp airway culture (Asp+) at Sophia Children’s Hospital between 1988 and 2021, four Asp disease phenotypes were defined based on serum Asp-specific IgE (IgEAsp) and IgG (IgGAsp): colonisation, sensitisation, bronchitis, and allergic bronchitis.