IFNAR2 and infection: DV2ChimV, at a dose of 4.5 × 107 FFU per animal, caused lethal infection in IFN-α/β–γRdKO mice but not in NZBWF1/Slc, C3H/HeSlc, C57BL/6, or IFN-α/βR single-knockout mice (Table 1).