IFITM3 and infection: Despite similar weight loss in IFITM3 KO mice, infection with PR8-miR133b/206 resulted in a modest, statistically significant benefit in terms of survival as compared to infection with PR8-miRctrl (median survival times of 10 days for PR8-miRctrl versus 12 days for PR8-miR133b/206) (Fig. 2F).