RT - SR - Electronic T1 - Epidemiological Features of COVID-19 in Northwest Russia in 2021 JF - Viruses SP - 2022-08-31 DO - 10.3390/v14050931 A1 - , A1 - , A1 - , A1 - , A1 - , A1 - , A1 - , A1 - , A1 - , A1 - , A1 - , YR - 2022-07-01 UL - https://pasteur.elpub.ru/publication/1756 AB -