[1] Univ Rochester, Sch Med & Dent, Dept Neurol, Rochester, NY 14642 USA
[2] Univ Rochester, Sch Med & Dent, Dept Microbiol, Rochester, NY 14642 USA
[3] Univ Rochester, Sch Med & Dent, Dept Immunol, Rochester, NY 14642 USA
[4] Washington Univ, Sch Med, Dept Neurol & Neurosurg, St Louis, MO 63110 USA