Peripheral type 1 IFN levels were higher in Ebi2−/− mice infected with virus 3 days post-infection compared to WT littermates, (Figure 1C; 2.12-fold higher for IFN-α, 1.66-fold higher for IFN-β; p = 0.001, 0.020, respectively). This evidence concerns the gene IFNA1 and infection.