Differentially expressed miRNAs in virus-infected mouse lungs at 1 dpi and 3 dpi. Venn diagram and heat maps indicate expressed miRNAs during w81 or ma81 infections relative to the mock infection (control). Red and green colors represent up- and down-regulation, respectively. Fold change ≥2 or ≤−2, P value ≤0.05. A: w81-infected mouse lungs, B: ma81-infected mouse lungs.