[1] Massachusetts Gen Hosp, Div Infect Dis, Boston, MA 02114 USA
[2] Massachusetts Gen Hosp, Dept Pathol, Boston, MA 02114 USA
[3] Brigham & Womens Hosp, Div Infect Dis, Boston, MA 02115 USA
[4] Beth Israel Deaconess Med Ctr, Div Viral Pathogenesis, Boston, MA 02215 USA
[5] Beth Israel Deaconess Med Ctr, Dept Neurol, Boston, MA 02215 USA