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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
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Corresponding Author: Rochelle P. Walensky, MD, MPH, Division of Infectious Diseases, Massachusetts General Hospital, 55 Fruit St, Bul130, Boston, MA 02114 (firstname.lastname@example.org).
Conflict of Interest Disclosures: Dr del Rio reported grants from NIH/NIAID. No other disclosures were reported.
Published Online: April 17, 2020. doi:10.1001/jama.2020.6572
Additional Contributions: We thank Loren D. Walensky, MD, PhD, for his critical review and editing of the manuscript and Nicole McCann for her technical assistance.
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