[1] St Petersburg Pasteur Inst, Lab Mol Immunol, Mira St 14, St Petersburg 197101, Russia
[2] Pavlov First State Med Univ St Petersburg, Dept Immunol, Lva Tolstogo St 6-8, St Petersburg 197022, Russia
[3] St Petersburg State Pediat Med Univ, Dept Infect Dis Adults & Epidemiol, Litovskaya St,Bldg 2, St Petersburg 194100, Russia