CCR2+CD4+T cells and ILD disease severity. Percentages of CCR2+CD4+ T cells in bronchoalveolar lavage fluid (BALF) of children with interstitial lung disease (ILD) related to ILD disease severity. Percentages of CCR2+CD4+ T cells were analyzed in BALF by flow cytometry. ILD disease severity was scored according to the ILD score of Fan(40): 1 = asymptomatic, no desaturation; 2 = symptomatic but normoxic (> 90%) under all conditions; 3 = symptomatic with desaturation during sleep or with exercise; 4 = symptomatic with desaturation at rest; Median values are shown by horizontal bars. Differences between the patient groups were tested with the Mann-Whitney U test; * p < 0.05, ** p < 0.01; Children with systemic corticosteroid therapy are shown as grey circles. P: Pulmonary alveolar proteinosis; S: Sarcoidosis; † symbolize the children who died due to respiratory failure.