1. From the Department of Infectious Diseases, Royal Adelaide Hospital, Adelaide, SA, Australia (M.B.R.); and the Departments of Emergency Medicine and Surgery (J.L.), Radiology (M.C.M.), Medicine (A.Y.K., E.E.C.), and Pathology (C.H.), Massachusetts General Hospital, and the Departments of Emergency Medicine and Surgery (J.L.), Radiology (M.C.M.), Medicine (A.Y.K., E.E.C.), and Pathology (C.H.), Harvard Medical School — both in Boston.