IL2 and bronchiolitis: Pathways of several cytokines, such as IL-1, IL-2, and IL-23 were predicted to be significantly upregulated in RSV- compared to RV-only bronchiolitis (z-score = -2.84, p-value = 0.003; z-score = -3.357, p-value = 0.004; and z-score = -2.53, p-value = 0.034, respectively) (Supplementary Table 1).