As part of pandemic preparedness, epidemiologists promote “containment strategies” designed to prevent community transmission. For coronavirus disease 2019 (COVID-19), countries like South Korea—an example of successful containment—had a coordinated governmental response, testing on a massive scale, and prompt contact tracing and quarantine.1 The first cases of South Korea’s COVID-19 outbreak were in mid-January; by late February, South Korea was testing more than 10 000 people daily and, as a result, cases peaked on February 28. Since April 5, 2020, no more than 53 new cases daily have occurred nationwide.1