Transmission potential of the Omicron variant of SARS-CoV-2 in South Korea: From November 25, 2020 to January 8, 2022

Our study indicates sustained transmission (effective reproduction number 1.3;serial interval 4.2 days;regional doubling times 3.3–11.4 days) of the severe acute respiratory syndrome coronavirus 2 Omicron (B.1.1.529) variant (n = 2351) in South Korea (November 25, 2021–January 8, 2022), implicating insufficient protection through vaccination and supporting non-pharmaceutical control measures.