Fig. 1.
Incidence of COVID-19 and transmissibility of SARS-CoV-2 in South Korea. A The reported number of confirmed COVID-19 cases by symptom onset date outside of the Daegu-Gyeongsangbuk region in South Korea. The dates of first clinical assessment were used for cases who were asymptomatic at presentation. There were key events against the spread of SARS-CoV-2 including a general election (on 15 April 2020), relaxing strict social distancing measures (from 20 April 2020) and relaxing the social distancing measure further (from 6 May 2020), distribution of COVID-19 relief funds to the general public (from 11 May 2020) and resuming school (from 20 May 2020). B Estimated daily Rt of SARS-CoV-2 in blue line with 95% credible interval in light grey shaded area. The red horizontal dashed line indicates the critical threshold of Rt = 1. The vertical grey dashed line divided the study period on first epidemic waves (19 January–19 April 2020) and second epidemic waves (20 April–11 August 2020). Notes: COVID-19 = coronavirus disease 2019, SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2, Rt = effective reproductive number