ompB mutant R. parkeri are severely attenuated in mice, as evaluated by measuring p.f.u. in organs of WT mice after i.v. infection (Engström et al., 2019) or by measuring lethality in Ifnar1-/-;Ifngr1-/- mice after i.v. infection (Burke et al., 2020). Here, IFNAR1 is linked to infection.