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We have read with great interest the comments by Dr Persson1 on our recent paper in Thorax,2 in which we showed that clinical control of asthma associated significantly with lower numbers of activated eosinophils in the bronchial wall, yet only weakly with sputum eosinophils. As the number of eosinophils in biopsies did not associate with clinical control of asthma, we speculated that activation of eosinophils (measured as eosinophil protein X (EXP)-immunopositive pixels per area) in bronchial biopsies reflects the level of disease control better than the number of eosinophils itself.2 As lysis of activated …