The NEW ENGLAND JOURNAL of MEDICIN E CASE RECORDS of the MASSACHUSET GENERAL HOSPITAL Founded by Richard C.Cabot EricS.Rosenberg,M.D.,Editor Nancy Lee Harris, M.D.,Editor Jo-Anne O. Shepard, M.D., Associate Editor Alice M. Cort, M.D., Associate Editor Sally H. Ebeling, Assistant Editor Emily K. McDonald, Assistant Editor Case 24-2015: A 28-Year-Old Pregnant Woman with Fever, Chills, Headache, and Fatigue