article on covid 19 with full format
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covid 19-corona virus disease 2019
Covid 19 is very dangrous disease which was effected the whole world..
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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 categorical 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.
Since the first imported case of coronavirus disease (COVID-19) was confirmed in South Korea on January 20, 2020, a sharp increase in the number of COVID-19 cases has been observed, with most infections being reported from specific clusters. Outbreaks of COVID-19 related to mass gathering, religious activities, workplaces, and hospitals have accounted for the largest portion cases in the national outbreak.
In March 2020, the Korea Centers for Disease Control and Prevention (KCDC), South Korea’s national-level public health authority, was informed about a cluster of cases of COVID-19 in a call center located in a commercial–residential mixed-use building (building X) in the capital city of Seoul. We describe the epidemiology of this COVID-19 outbreak and detail the containment efforts to limit the spread of the disease.
On March 8, the Seoul Metropolitan Government was notified of a confirmed case of COVID-19 in a person who worked in building X; the case reportedly was associated with a possible cluster of cases.
On March 9, KCDC and local governments (in Seoul, the city of Incheon, and Gyeonggi Province) formed a joint response team and launched an epidemiologic investigation with contact tracing. Building X is a 19-story floor in one of the busiest urban area of Seoul. Commercial offices are located on the 1st through 11th floors, and residential apartments are located on the 13th through 19th floors. We identified and investigated 922 employees who worked in the commercial offices, 203 residents who lived in the residential apartments, and 20 visitors. The call center is located on the 7th through 9th floors and the 11th floor; it has a total of 811 employees. Employees do not generally go between floors, and they do not have an in-house restaurant for meals.
We defined a patient under investigation (PUI) as one who worked at, lived at, or visited building X during February 21–March 8, 2020. We defined a confirmed case-patient as a PUI with a positive COVID-19 laboratory test. We confirmed the diagnosis of COVID-19 by using real-time reverse transcription PCR assays. We defined a symptomatic case-patient as a confirmed case-patient with symptoms at the time of positive testing, a presymptomatic case-patient as a confirmed case-patient who was asymptomatic at the time of positive testing but later had symptoms during the 14 days of monitoring, and an asymptomatic case-patients as confirmed a case-patient with a positive COVID-19 test result who remained asymptomatic during the entire 14-day period.
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