On April 14, 2020, 46 close contact cases of South Koreans (Sung Gwang Vina Co., Ltd.) were sampled and tested for the second time before the concentrated isolation. The cumulative total of suspected cases to date is 84 cases, all 84 cases are negative for SARS-CoV-2. Number of isolated cases with concentrated isolation: 48 cases. Total cases of concentrated isolation time expired: 215 people. The number of isolated cases at home and residence is 38 people. The total number of isolated quarantine cases at home and residence is 4.659 people.