1. From Moderna, Cambridge (S.C., N.M., J.E.T., X.C., Y.C., A.S., B.G., D.K.E., J.F., H.Z., J.M.M., R.D.), and Brigham and Women’s Hospital, Boston (S.R.W., L.R.B.) — both in Massachusetts; Meridian Clinical Research, Norfolk (C.H., K.V.), Meridian Clinical Research, Omaha (B.E.), and Meridian Clinical Research, Grand Island (A.B.) — all in Nebraska; and the Department of Surgery, Duke University Medical Center, Durham, NC (D.C.M.).