This research is supported in part by the National Institutes of Health R35GM119850 (N.E.L.), NNF10CC1016517 (N.E.L.), R01AI139238 (M.A.B.), R01AI147884-01A1S1 (B.C.); Massachusetts Consortium on Pathogen Readiness (B.C.); and National Institutes of Health U01CA207824 (R.J.W.), P41GM103390 (R.J.W.), P41GM103490 (M.T. and L.W.), U01GM125267 (M.T.), and R01GM130915 (L.W.).