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1.
J Korean Med Sci ; 35(34): e314, 2020 Aug 31.
Article in English | MEDLINE | ID: mdl-32864911

ABSTRACT

A 14-day quarantine is implemented in many countries in response to the coronavirus disease pandemic. Korea implemented a mandatory quarantine for those who had close contact with infected patients and those returning from abroad. The present study explored the implications of mandatory coronavirus disease 2019 testing before releasing individuals from the 14-day quarantine in Incheon, Korea. From February 11 to July 5, 2020, 19,296 people were self-quarantined, and 56 (0.3%) of them were confirmed cases of COVID-19. Twenty (35.7%) were identified through the reporting of symptoms during quarantine, and 32 (57.1%) were identified using mandatory pre-release RT-PCR tests. Among the 32, 14 (25%) individuals reported mild symptoms and 18 (32.1%) were asymptomatic. It is suggested that mandatory diagnostic testing prior to release and the symptom-based surveillance after the 14-day quarantine may help control delayed or asymptomatic COVID-19 cases.


Subject(s)
Clinical Laboratory Techniques , Coronavirus Infections/diagnosis , Coronavirus Infections/epidemiology , Infection Control/legislation & jurisprudence , Pneumonia, Viral/diagnosis , Pneumonia, Viral/epidemiology , Public Health/legislation & jurisprudence , Adolescent , Adult , Aged , Aged, 80 and over , Betacoronavirus/isolation & purification , COVID-19 , COVID-19 Testing , Contact Tracing , Female , Humans , Infection Control/methods , Male , Middle Aged , Pandemics , Quarantine , Republic of Korea/epidemiology , Reverse Transcriptase Polymerase Chain Reaction/methods , SARS-CoV-2 , Young Adult
2.
Emerg Infect Dis ; 26(8): 1666-1670, 2020 Aug.
Article in English | MEDLINE | ID: mdl-32324530

ABSTRACT

We describe the epidemiology of a coronavirus disease (COVID-19) outbreak in a call center in South Korea. We obtained information on demographic characteristics by using standardized epidemiologic investigation forms. We performed descriptive analyses and reported the results as frequencies and proportions for categoric variables. Of 1,143 persons who were tested for COVID-19, a total of 97 (8.5%, 95% CI 7.0%-10.3%) had confirmed cases. Of these, 94 were working in an 11th-floor call center with 216 employees, translating to an attack rate of 43.5% (95% CI 36.9%-50.4%). The household secondary attack rate among symptomatic case-patients was 16.2% (95% CI 11.6%- 22.0%). Of the 97 persons with confirmed COVID-19, only 4 (1.9%) remained asymptomatic within 14 days of quarantine, and none of their household contacts acquired secondary infections. Extensive contact tracing, testing all contacts, and early quarantine blocked further transmission and might be effective for containing rapid outbreaks in crowded work settings.


Subject(s)
Betacoronavirus/pathogenicity , Coronavirus Infections/epidemiology , Coronavirus Infections/transmission , Disease Outbreaks , Pneumonia, Viral/epidemiology , Pneumonia, Viral/transmission , Betacoronavirus/genetics , COVID-19 , COVID-19 Testing , Call Centers , Clinical Laboratory Techniques/methods , Contact Tracing/statistics & numerical data , Coronavirus Infections/diagnosis , Family Characteristics , Female , Humans , Incidence , Male , Pandemics , Pneumonia, Viral/diagnosis , Quarantine/methods , Republic of Korea/epidemiology , Reverse Transcriptase Polymerase Chain Reaction , SARS-CoV-2 , Severity of Illness Index
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