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[Epidemiological characteristics of infection in COVID-19 close contacts in Ningbo city].
Chen, Y; Wang, A H; Yi, B; Ding, K Q; Wang, H B; Wang, J M; Shi, H B; Wang, S J; Xu, G Z.
  • Chen Y; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Wang AH; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Yi B; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Ding KQ; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Wang HB; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Wang JM; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Shi HB; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Wang SJ; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
  • Xu GZ; Department of Communicable Disease Control and Prevention, Department of Occupational Health and Environmental Health, Ningbo Municipal Centre for Disease Control and Prevention, Ningbo 315010, China.
Zhonghua Liu Xing Bing Xue Za Zhi ; 41(5): 667-671, 2020 May 10.
Article in Chinese | MEDLINE | ID: covidwho-367950
ABSTRACT

Objective:

To estimate the infection rate of close contacts of COVID-19 cases, and to evaluate the risk of COVID-19 under different exposure conditions.

Methods:

A prospective study was used to conduct continuous quarantine medical observations of close contacts of people infected with COVID-19, collect epidemiological, clinical manifestations, and laboratory test data to estimate the infection rate of close contacts under different exposures.

Results:

The epidemiological curve of COVID-19 in Ningbo showed persistent human-to-human characteristics. A total of 2 147 close contacts were tracked and investigated. The total infection rate was 6.15%. The infection rates of confirmed cases and positive contacts were 6.30% and 4.11%, respectively. The difference was not statistically significant (P>0.05). Among close contacts of different relationships, friends/pilgrims (22.31%), family members (18.01%), and relatives (4.73%) have a higher infection rate, and close contacts of medical staff were not infected. Differences in infection rates among the close contacts were statistically significant (P<0.005). Living with the case (13.26%), taking the same transportation (11.91%), and dining together (7.18%) are high risk factors for infection. Cross-infection in the hospital should not be ignored (1.94%). The median of incubation period is 5 days.

Conclusion:

The infection rate of close contacts of COVID-19 cases is high, and isolation medical observation measures should be implemented in strict accordance with the close contact management plan.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Pneumonia, Viral / Cross Infection / Coronavirus Infections Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Limits: Humans Country/Region as subject: Asia Language: Chinese Journal: Zhonghua Liu Xing Bing Xue Za Zhi Year: 2020 Document Type: Article Affiliation country: Cma.j.cn112338-20200304-00251

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Pneumonia, Viral / Cross Infection / Coronavirus Infections Type of study: Cohort study / Experimental Studies / Observational study / Prognostic study / Randomized controlled trials Limits: Humans Country/Region as subject: Asia Language: Chinese Journal: Zhonghua Liu Xing Bing Xue Za Zhi Year: 2020 Document Type: Article Affiliation country: Cma.j.cn112338-20200304-00251