1. Jinan Municipal Center for Disease Control and Prevention, Jinan, Shandong 250021, China; 2. The First Affiliated Hospital of Shandong First Medical University, Jinan, Shandong 250014, China
Abstract：Objective To survey and analyze the epidemiological characteristics of 51 COVID-19 patients and their close contacts in Jinan City, and to provide a scientific basis for COVID-19 epidemic prevention and control. Methods Demographic, epidemiological and clinical data related to the COVID-19 patients and their close contacts in Jinan City as of March 18, 2020 were collected, and descriptive epidemiological methods were used for an analysis. Results The infected persons were mainly concentrated in Lixia District, Huaiyin District, Shizhong District, Changqing District and Tianqiao District, accounting for 92.16%. The male-to-female ratio was 0.89∶1. Age distribution showed that the group aged 30 years was the highest (37.26%). Most of the cases were common cases (70.59%). The history of exposure was dominated by Wuhan residence history (43.14%). There was obvious family clustering (74.51%). A total of 1,095 individuals wereinvolved in the management as close contacts of the infected persons, and 15 of them were confirmed to be infected, with an infection rate of 1.37%. There were statistically significant differences in the infection rate among different contact patterns, relationships with the infected persons, and frequencies of contact (all P<0.05), of which the infection rates were found to be highest in living with and sharing meals with (11.01%), kinship (10.37%) and frequent contact (11.43%) with the infected persons. Among the family close contacts, the infection rates of children and the elderly were higher. Conclusions COVID-19 is extremely easy to cause infections among family members. Enhancing publicity and education for key groups and implementing targeted protective measures are of great significance to prevention and control of the spread of the epidemic.
2021, Vol. 28 
