Risk factors associated with COVID-19 infection: a retrospective cohort study based on contacts tracing. Issue 1 (1st January 2020)

• Record Type: Journal Article
• Authors: Liu, Tao; Liang, Wenjia; Zhong, Haojie; He, Jianfeng; Chen, Zihui; He, Guanhao; Song, Tie; Chen, Shaowei; Wang, Ping; Li, Jialing; Lan, Yunhua; Cheng, Mingji; Huang, Jinxu; Niu, Jiwei; Xia, Liang; Xiao, Jianpeng; Hu, Jianxiong; Lin, Lifeng; Huang, Qiong; Rong, Zuhua; Deng, Aiping; Zeng, Weilin; Li, Jiansen; Li, Xing; Tan, Xiaohua; Kang, Min; Guo, Lingchuan; Zhu, Zhihua; Gong, Dexin; Chen, Guimin; Dong, Moran; Ma, Wenjun;
• Is Part Of: Emerging microbes & infections. Volume 9:Issue 1(2020)
• Page Start: 1546
• Page End: 1553
• Publication Date: 2020-01-01
• Subjects: COVID-19 -- attack rate -- risk factors -- close contact -- China; Medical microbiology -- Periodicals; Communicable diseases -- Periodicals; Infection -- Periodicals; 616.9041
• DOI: 10.1080/22221751.2020.1787799
• Languages: English
• ISSNs: 2222-1751

Abstract

ABSTRACT: This study aimed to estimate the attack rates, and identify the risk factors of COVID-19 infection. Based on a retrospective cohort study, we investigated 11, 580 contacts of COVID-19 cases in Guangdong Province from 10 January to 15 March 2020. All contacts were tested by RT-PCR to detect their infection of SARS-COV-2. Attack rates by characteristics were calculated. Logistic regression was used to estimate the risk factors of infection for COVID-19. A total of 515 of 11, 580 contacts were identified to be infected with SARS-COV-2. Compared to young adults aged 20–29 years, the infected risk was higher in children (RR: 2.59, 95%CI: 1.79–3.76), and old people aged 60–69 years (RR: 5.29, 95%CI: 3.76–7.46). Females also had higher infected risk (RR: 1.66, 95%CI: 1.39–2.00). People having close relationship with index cases encountered higher infected risk (RR for spouse: 20.68, 95%CI: 14.28–29.95; RR for non-spouse family members: 9.55, 95%CI: 6.73–13.55; RR for close relatives: 5.90, 95%CI: 4.06–8.59). Moreover, contacts exposed to index case in symptomatic period (RR: 2.15, 95%CI: 1.67–2.79), with critically severe symptoms (RR: 1.61, 95%CI: 1.00–2.57), with symptoms of dizzy (RR: 1.58, 95%CI: 1.08–2.30), myalgia (RR: 1.49, 95%CI: 1.15–1.94), and chill (RR: 1.42, 95%CI: 1.05–1.92) had higher infected risks. Children, old people, females, and family members are susceptible of COVID-19 infection, while index cases in the incubation period had lower contagiousness. Our findings will be helpful for developing targeted prevention and control strategies to combat the worldwide pandemic.