IFNA1 and infection: This was confirmed by the expression level of IFN-α which tended to be higher on days 5 and 7 post-infection (P = 0.06) (Fig 4C) and that of IFN-β which was significantly increased compared to WT on day 5 (P = 0.04) but not on day 7 post-infection (P = 0.06, Fig 4D).