V. V. Tsvetkov
Smorodintsev Research Institute of Influenza;Leningrad Region Center for Prevention and Control of AIDS and Communicable Diseases
Russian Federation

Valeriy V. Tsvetkov, Cand. of Sci, (Med), Senior Researcher; Infectionist

15/17, Professor Popova St., Saint-Petersburg, 197376, Russia

16 Mira St., St. Petersburg, 197101, Russia

I. I. Tokin
Smorodintsev Research Institute of Influenza; North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Ivan I. Tokin, Cand. of Sci, (Med), Head of the Department of Experimental Therapy of Viral Hepatitis; Associate Professor of the Department of Infectious Diseases

15/17, Professor Popova St., Saint-Petersburg, 197376, Russia

41, Kirochnaya St., St. Petersburg, 191015, Russia

S. A. Pozdnjakova
Leningrad Region Center for Prevention and Control of AIDS and Communicable Diseases
Russian Federation

Svetlana A. Pozdnjakova, Epidemiologist

16 Mira St., St. Petersburg, 197101, Russia