Epidemiological characteristics of confirmed COVID-19 cases in Tianjin

Xiaochun Dong; Jiameng LI; Jianyun Bai; Zhongquan Liu; Penghui Zhou; Lu Gao; Xiaoyan LI; Ying Zhang

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Epidemiological characteristics of confirmed COVID-19 cases in Tianjin

VernacularTitle: 天津市新型冠状病毒肺炎确诊病例流行病学特征分析
Author: Xiaochun DONG ¹ ; Jiameng LI ¹ ; Jianyun BAI ¹ ; Zhongquan LIU ¹ ; Penghui ZHOU ¹ ; Lu GAO ¹ ; Xiaoyan LI ¹ ; Ying ZHANG ¹
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1. Tianjin Centers for Diseases Control and Prevention, Tianjin 300011, China
Publication Type:Journal Article
Keywords: COVID-19; Outbreak; Epidemiological characteristics
From: Chinese Journal of Epidemiology 2020;41(5):638-642
CountryChina
Language:Chinese
Abstract: Objective To investigate the clinical and epidemiological characteristics of 135 confirmed cases of COVID-19 in Tianjin. Methods The clinical and epidemiological data of 135 cases of COVID-19 in Tianjin were collected, and the data were analyzed with descriptive method. The factors influencing the severity of the illness were analyzed. Results Among the 135 COVID-19 cases, 72 were males and 63 were females, the age of the cases was (48.62±16.83) years, and the case fatality rate was 2.22%. Local transmission caused 74.81% of the cases. A total of 33 clusters occurred, involving 85.92% of all COVID-19 cases. The median of the incubation period of COVID-19 was 6.50 days, the average generation interval was 5 days, and the household secondary transmission rate was 20.46%. Fever was the main symptom (78.63%), followed by cough (56.48%). Multivariate regression analysis indicated that age ( OR =1.038, 95% CI : 1.010-1.167) and the number of chronic underlying diseases ( OR =1.709, 95% CI : 1.052-2.777) were the risk factors of severe illness. Conclusions Fever was the main symptom at the early phase of COVID-19 in Tianjin, and the local cluster cases accounted for high proportion in confirmed COVID-19 cases reported in Tianjin. Severe illness was prone to occur in people with old age and multi underlying diseases. Strict isolation of close contacts and intensive care of high-risk groups are the main measures to reduce the morbidity and case fatality of COVID-19.