(a) Survival of Ifnar1-/-;Ifngr1-/- mice upon i.v. infection with 5 × 106 PFU of R. parkeri. n = 7 (WT), 10 (sca2::Tn), and 7 (MC1_RS08740::Tn R. parkeri) individual mice. This evidence concerns the gene IFNAR1 and infection.