[1] Robert Koch Inst, D-13353 Berlin, Germany
[2] Russian Acad Med Sci, Viral Preparat Res Inst, Moscow 109801, Russia
[3] G N Grabrichevsky Moscow Res Inst Epidemiol & Mic, Moscow, Russia
[4] State Sci Ctr Virol & Biotechnol Vector Koltsovo, Res Inst Mol Biol, Novosibirsk, Russia
[5] Natl Inst Publ Hlth, Prague, Czech Republic
[6] Med Lab, Stuttgart, Germany
[7] Inst Virol Infect Dis & Epidemiol, Stuttgart, Germany