I. I. Tokin
Research Institute of Influenza, Ministry of Health of Russia, 15/17 Professor Popov St., St. Petersburg, 97376, Russia I.I. Mechnikov North-Western State Medical University, Ministry of Health of Russia, 47 Piskarevskiy proyezd, St. Petersburg, 195067, Russia
Russian Federation

I. B. Tokin
St. Petersburg State University,7 University Quay, St. Petersburg, 199034, Russia
Russian Federation

T. V. Sologub
Research Institute of Influenza, Ministry of Health of Russia, 15/17 Professor Popov St., St. Petersburg, 97376, Russia
Russian Federation

G. F. Filimonova
I.I. Mechnikov North-Western State Medical University, Ministry of Health of Russia, 47 Piskarevskiy proyezd, St. Petersburg, 195067, Russia St. Petersburg State University,7 University Quay, St. Petersburg, 199034, Russia
Russian Federation

P. Hussar
Institute of Anatomy, Tartu University, 18 Yulikooli St., Tartu, 50090, Estonia
Russian Federation