Although therapeutic αIFN-γ did not restore eosinophilia in Il10ΔCD4 mice, it reduced numbers of neutrophils (see Fig E7, B and C) and IFN-γ+ CD4+ T cells (Fig 7, E) in BAL fluid to levels comparable with those in Il10fl/fl control mice, suggesting that IFN-γ promotes airway inflammation in these mice. Here, CD4 is linked to Increased total eosinophil count.