Journal of Shandong University (Health Sciences) ›› 2020, Vol. 58 ›› Issue (10): 89-94.doi: 10.6040/j.issn.1671-7554.0.2020.0674

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Epidemiological characteristics of COVID-19 in Xi’an city

ZHANG Hui1, SONG Shuxuan2, LIU Jifeng1, HE Zhen2, SHAO Zhongjun2, LIU Kun2   

  1. 1. Department of Infectious Disease Control, Xian Center for Disease Control and Prevention, Xian 710054, Shaanxi, China;
    2. Department of Epidemiology, Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Air Force Medical University, Xian 710032, Shaanxi, China
  • Published:2020-10-08

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Abstract: Objective To analyze the epidemiological characteristics of confirmed cases of coronavirus disease 2019(COVID-19)in Xian, so as to provide scientific basis for the prevention and control measures. Methods Data of COVID-19 cases were collected from the official website of Xian Health Commission and Shaanxi Province Health Commission, and analyzed with descriptive epidemiological analysis, Wilcoxon rank sum test and Kruskal-Wallis H test. Results Totally 125 cases(67 male and 58 female)were reported as of March 31. The average age of patients was(48.23±15.94, range 13-89)years, and those aged 35-54 years accounted for 44.00%(55/125). There were 52 imported cases and 73 local secondary cases, 117 of which had clear sources of infection while 8 cases had not. Death occurred in 3 cases. Altogether 23 cluster outbreaks were reported, involving 89 cases, among which 13(56.52%)were family clusters involving 38 cases(42.70%). The top three districts with reported cases were Yanta(29 cases), Xincheng(20 cases)and Lianhu(16 cases). Epidemic curve showed two peaks on Jan. 28(11 cases)and Jan. 31(10 cases), 2020. The median days were 1.0(0.5, 3.0)d from onset to the first visit, 4.0(3.0,6.5)d from the first visit to diagnosis, and 7.0(4.0,10.0)d from onset to diagnosis. There were significant differences in the days from the first visit to diagnosis between imported cases and local secondary cases(Z=-2.107, P=0.035), and in the days from onset to diagnosis between the cases who took medications and who did not take medications before the first visit(Z=-2.690, P=0.007). Conclusion The epidemic curve of COVID-19 in Xian could be divided into 3 phases: imported cases from other provinces, local secondary cases and imported cases from abroad. Family cluster was an important characteristic of COVID-19 in Xian. Imported cases could be diagnosed earlier than local secondary cases. Self-treatment before the first visit could affect the laboratory confirmation of COVID-19. Preventing imported cases from abroad is still the focus of future efforts.

Key words: Coronavirus disease 2019, Epidemiological characteristic, Family cluster

CLC Number: 

  • R181.3
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