1. Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP), prem. 8, k.17, pos. Institut Poliomielita, poselenie Moskovskiy, Moscow 108819, Russia
2. Lomonosov MSU, Faculty of Biology, Lenin Hills, 1/12, Moscow 119234, Russia
3. Sechenov First Moscow State Medical University, Moscow, Russia
4. Research Institute of Occupational Health, Moscow, Russia
5. Central Research Institute for Epidemiology (CRIE), Federal Service on Consumer Rights Protection and Human Well-Being Surveillance, Moscow, Russia