School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China.
Magill Medical Center, Adelaide, SA, Australia.
Front Public Health. 2023 Mar 29;11:1143468. doi: 10.3389/fpubh.2023.1143468. eCollection 2023.
Previous studies investigating the characteristics of imported cases were mostly limited to a certain province/city or a specific sub-group during a certain period with a small sample size, which may not provide an overall picture of the characteristics of imported cases. In this scoping literature review, we comprehensively synthesized the epidemiological characteristics of overseas imported COVID-19 cases into China by retrieving six literature databases, with aims to provide implications for more targeted control, prevention, and medical treatment of this disease. After dropping duplicates and reviewing titles, abstracts, and full-texts, 50 articles were included in the review finally, including 26 (52%) articles in English and 24 (48%) articles in Chinese. According to the type of data sources, the 50 studies were divided into three categories: 13 (26%) articles using data sourced from the Chinese Infectious Diseases Online Reporting System, 15 (30%) articles using data from the websites of national/local health departments, and 22 (44%) articles using hospital admission data. Most of the overseas imported COVID-19 cases were young and middle-aged Chinese students and businessmen returning from the United States, Europe, and some neighboring countries. Airport routine health screening measures could not identify COVID-cases effectively, although scheduled multiple nucleic acid tests were required before boarding. Almost all imported cases were identified during the hotel quarantine period. Although a large proportion of imported cases were asymptomatic or with mild symptoms in the published literature, they may be due to participant selection bias. The exact proportion of asymptomatic cases may need to be further investigated especially through population-based large-scale studies.
先前研究海外输入病例特征的工作大多局限于某一省/市或特定时间段的特定亚组，且样本量较小，这可能无法全面描绘输入病例的特征。在本次范围性文献综述中，我们通过检索六个文献数据库，综合了输入性 COVID-19 病例的流行病学特征，旨在为该疾病更有针对性的控制、预防和治疗提供启示。在去除重复项并对标题、摘要和全文进行审查后，最终有 50 篇文章被纳入综述，其中包括 26 篇（52%）英文文章和 24 篇（48%）中文文章。根据数据来源类型，这 50 项研究分为三类：13 项（26%）文章使用了源自中国传染病在线报告系统的数据，15 项（30%）文章使用了国家/地方卫生部门网站的数据，22 项（44%）文章使用了医院入院数据。大多数输入性 COVID-19 病例是从美国、欧洲和一些邻国返回的年轻和中年中国学生和商人。机场常规卫生筛查措施无法有效识别 COVID-19 病例，尽管登机前需要多次进行核酸检测。几乎所有输入性病例都是在酒店检疫期间被发现的。尽管在已发表的文献中，输入性病例的很大一部分是无症状或轻症，但这可能是由于参与者选择偏倚所致。无症状病例的确切比例可能需要进一步通过基于人群的大规模研究来调查。
