[1] Free Univ Berlin, Charite Univ Med Berlin, Dept Neurol, D-10117 Berlin, Germany
[2] Humboldt Univ, Charitepl 1, D-10117 Berlin, Germany
[3] Free Univ Berlin, Charite Univ Med Berlin, Inst Virol, Charitepl 1, D-10117 Berlin, Germany
[4] Free Univ Berlin, Charite Univ Med Berlin, Dept Neurol, Berlin, Germany
[5] Humboldt Univ, Berlin, Germany
[6] Free Univ Berlin, Charite Univ Med Berlin, Inst Virol, Berlin, Germany
[7] Humboldt Univ, Germany German Ctr Infect Res DZ, Berlin, Germany
[8] Christian Albrechts Univ Kiel, Inst Infect Med, Germany Lab, Kiel, Germany
[9] Univ Med Ctr Schleswig Holstein, Germany Lab, Kiel, Germany