Epidemiological characteristics of COVID-19 in Gansu province
10.3760/cma.j.cn112338-20200229-00216
- VernacularTitle:甘肃省新型冠状病毒肺炎流行病学特征分析
- Author:
Faxiang GOU
1
;
Xiaoshu ZHANG
;
Jinxi YAO
;
Deshan YU
;
Kongfu WEI
;
Hong ZHANG
;
Xiaoting YANG
;
Jianjun YANG
;
Haixia LIU
;
Yao CHENG
;
Xiaojuan JIANG
;
Yunhe ZHENG
;
Bin WU
;
Xinfeng LIU
;
Hui LI
Author Information
1. 甘肃省疾病预防控制中心，兰州 730000
- Keywords:
COVID-19;
Epidemiological characteristic
- From:
Chinese Journal of Epidemiology
2020;41(9):1415-1419
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To understand the epidemiological characteristics of COVID-19 cases in different epidemic stages in Gansu province.Methods:Epidemiological investigation was conducted to collect the information of confirmed COVID-19 cases, including demographic, epidemiological and clinical information.Results:As of 25 February 2020, a total of 91 confirmed COVID-19 cases had been reported in Gansu. The epidemic of COVID-19 in Gansu can be divided as three different stages, i.e. imported case stage, imported-case plus indigenous case stage, and indigenous case stage. A total of 63 cases were clustered cases (69.23%), 3 cases were medical staff infected with non-occupational exposure.The initial symptoms included fever (54.95%, 50/91), cough (52.75%, 48/91), or fatigue (28.57%, 26/91), the proportion of each symptom showed a decreasing trend along with the three epidemic stages, but only the differences in proportions of fever (trend χ2=2.20, P<0.05) and fatigue (trend χ2=3.18, P<0.05) among the three epidemic stages were statistically significant. The cases with critical severe symptoms accounted for 42.85% (6/14), 23.73% (14/59) and 16.67% (3/18), respectively, in three epidemic stages, showed a decreasing trend ( H=6.45, P<0.05). Also, the incubation period prolonged along with the epidemic stage ( F=51.65, P<0.01), but the intervals between disease onset and hospital visit ( F=5.32, P<0.01), disease onset and diagnosis ( F=5.25, P<0.01) became shorter along with the epidemic stage. Additionally, the basic reproduction number ( R0) had decreased from 2.61 in imported case stage to 0.66 in indigenous case stage. Conclusions:The COVID-19 epidemic in Gansu was caused by the imported cases, and about 2/3 cases were clustered ones. No medical worker was observed to be infected by occupational exposure. With the progression of COVID-19 epidemic in Gansu, the change in initial symptom and incubation period suggests. the early screening cannot only depend on body temperature monitoring.
