ABSTRACT
In December 2019, an outbreak of pneumonia caused by a novel coronavirus, severe acute respiratory syndrome (SARS)-CoV-2, occurred in Wuhan city, Hubei province, China.1 South Korea saw its first confirmed Coronavirus Disease 2019 (COVID-19) case on January 20, 2020, when an infected woman from Wuhan, China arrived in S. Korea via Incheon International Airport.1 By mid-February, SARS-CoV-2 was rapidly spreading in the southern city of Daegu, S. Korea in proximity to three US Forces Korea (USFK) military installations. COVID-19 cases continued to increase during the following weeks, reaching a peak of nearly 1,000 confirmed cases per day by the end of February. As cases surged dramatically, over 28,000 USFK service members, family members, and Department of Defense (DoD) employees were at a risk of exposure to COVID-19. On February 24, clinicians diagnosed the first confirmed case in the USFK population, a 61 year-old widow of a retired service member. This individual, who experienced a mild illness, was the spouse of a retired US military veteran living in S. Korea. The retiree and his spouse both had access to military posts in S. Korea, and the spouse tested positive after she had been on one of the military bases in Area IV (Figure 1). The following day, USFK reported its first confirmed case in a service member, which was the triggering event for the 1st Area Medical Laboratory (AML) to deploy to S. Korea.
