Found this online Ling: Bronchiectasis is a heterogeneous disease. Although classically defined by neutrophilic inflammation, bronchial biopsies have shown increased eosinophil infiltration compared with those of healthy control individuals, and eosinophilic inflammation has been observed in the sputum of patients with bronchiectasis without a history of asthma.

Approximately one in five patients with bronchiectasis is shown to have eosinophilic inflammation, whether defined by sputum or blood eosinophil count.