Epidemiological characteristics of clustering outbreaks of 51 cases of COVID-19 in Xinyang, He’nan

Objective To analyze the occurrence characteristics and epidemic regularity of a new epidemic situation of COVID-19, and we provide scientific basis for formulating strategies and measures for epidemic prevention and control. Methods According to the “Guidelines for Epidemiological Investigation of Aggregated Epidemic Situation of COVID-19 (Trial Version)” by the National Health and Medical Commission, 274 confirmed cases of COVID-19 and 11 asymptomatic infections reported from January 13 to March 2, 2020 were carried out epidemiological investigations. Results There were a total of 51 cases of COVID-19 epidemic outbreaks in Xinyang City. The first case had 31 cases (60.78%) with travel or residence history in Wuhan and other places. The median incubation period was 7 days, and the median number of infections was 2. Including family gatherings were 45 cases (88.24%), mixed gathering 4 cases (7.84%), working gathering 2 cases (3.92%). A total of 139 confirmed cases and 10 asymptomatic infections were involved, accounting for 52.28% of the city′s total number of cases. There were 48 imported cases (32.21%), 101 local cases (67.79%); 85 first-generation cases (57.05%), 63 second-generation cases (42.28%), and 1 third-generation case (0.67%). In the history of exposure, there were 84 cases (56.38%) living together, 51 cases (34.23%) sharing dinner together, 12 cases (8.05%) in close working place, and 2 cases (1.34%) gathering in entertainment places. Conclusion The 51 cases of clustered epidemic is dominated by families. The exposure history of the cases is mostly living together and eating together. The first case of most clustered epidemics is those who traveled or lived in Wuhan and other places. The causes of most cases were linked with the outbreak of COVID-19 in Wuhan, Hubei. 摘要：目的 分析新型冠状病毒肺炎聚集性疫情的发生特点和流行规律, 为制定疫情防控策略和措施提供科学依 据。 方法 根据国家卫健委《新型冠状病毒肺炎聚集性疫情流行病学调查指南 (试行第一版) 》, 对 2020 年 1 月 13 日—3 月 2 日报告的 274 例新型冠状病毒肺炎确诊病例及 11 例无症状感染者开展流行病学调查研究。 结果 信阳市新冠肺 炎聚集性疫情共发生 51 起, 首例病例有武汉等地旅行或居住史者 31 起 (60.78%) , 发病潜伏期中位数为 7 d, 传染人数 中位数为 2 人。包括家庭聚集 45 起 (88.24%) , 混合聚集 4 起 (7.84%) , 工作聚集 2 起 (3.92%)。共涉及 139 例确诊病例 及 10 例无症状感染者, 占全市总病例数的 52.28%。输入性病例 48 例 (32.21%) , 本地病例 101 例 (67.79%) ; 一代病例 85 例 (57.05%) , 二代病例 63 例 (42.28%) , 三代病例 1 例 (0.67%)。暴露史有共同居住生活的 84 例 (56.38%) , 共同聚餐的 51 例 (34.23%) , 工作场所密切接触的 12 例 (8.05%) , 娱乐场所聚集的 2 例 (1.34%)。 结论 51 起聚集性疫情以家庭聚 集性为主; 病例的暴露史多为有共同居住生活史和共同聚餐史; 多数聚集性疫情的首例病例有武汉等地旅行或居 住史。