Resolution stage of acute respiratory illness. (A) Comparative analysis of acute respiratory illness-associated genes of D6 with respect to BL revealed that the resolution stage was characterized by a core transcriptional profile regardless of disease status (box). Complete gene lists generated for each comparison are outlined in Table S1 in Additional file 2. (B) Kinetics of shared-D6 gene expression in each study group (n = 16/time point) (C) Hierarchical clustering analysis of the D6 versus BL microarray expression of the core-D6 genes. (D) Quantitative real-time PCR confirmation of select core-D6 gene expression. Horizontal line depicts mean. *P ≤0.05. (E) Influence of medication use on core-D6 gene expression for all asthmatics. Horizontal line depicts mean. AQP9, Aquaporin 9; BL, baseline; GCN, fold change in normalized gene copy number; D2, day 2; D6, day 6; FCGR3A, Fc fragment of immunoglobulin G, low affinity IIIa, receptor (CD16a); KRT24, Keratin 24.