Fig. 3.

COVID-19 outbreak curve and timeline of implementation of major interventions in South Korea. Note: ① Jan 27, raising the public alert level to orange (3 out of 4 levels). ② Since Feb 4, a special entry procedure was introduced for all passengers entering South Korea from China and gradually extended to all global arrivals. ③ Feb 23, raising the public alert to the highest level and launching Drive-through screening centers. ④ On Feb 25, the Korean government imposed strict blockades in Daegu city and North Gyeongsang province. ⑤ On March 8, the nationwide distribution of public face masks. ⑥ Since April 1, all travelers entering South Korea are subject to a 14-day quarantine from the day after arrival. ⑦ On April 11, the government required that people who breached the self-quarantine rule should be worn electronic wristbands. ⑧ On April 19, softening social distancing measures. ⑨ On May 6, South Korea began to enter the phase of normal life and epidemic prevention and control. ⑩ On August 18, the Korean government declared a secondary level of social distance and banned gatherings of 50 people indoors