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Zhou B, Sun Y, Mao H, Su L, Lou Y, Yan H, Yao W, Chen H, Zhang Y. Molecular epidemiological characteristics of SARS-CoV-2 in imported cases from 2021 to 2022 in Zhejiang Province, China. Front Public Health 2023; 11:1189969. [PMID: 37427288 PMCID: PMC10323361 DOI: 10.3389/fpubh.2023.1189969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/30/2023] [Indexed: 07/11/2023] Open
Abstract
Backgrounds The coronavirus disease 2019 (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been a global threat since 2020. The emergence of the Omicron variant in 2021, which replaced Delta as the dominant variant of concern, has had a significant adverse impact on the global economy and public health. During this period, Zhejiang Province implemented dynamic zeroing and focused on preventing imported cases. This study aimed to gain clear insight into the characteristics of imported COVID-19 cases in Zhejiang Province. Methods We conducted a systematic molecular epidemiological analysis of 146 imported cases between July 2021 and November 2022 in Zhejiang Province. Virus samples with cycle threshold (Ct) value less than 32 were performed next generation sequencing. Basing the whole genome sequence obtained after quality control and assembly of reads, the whole genome variation map and phylogenetic tree were constructed and further analyzed. Results Our study identified critical months and populations for surveillance, profiled the variation of various lineages, determined the evolutionary relationships among various lineages of SARS-CoV-2, and compared the results in Zhejiang with those obtained worldwide during this period. Conclusion The continuous molecular epidemiological surveillance of imported cases of COVID-19 in Zhejiang Province during 2021 to 2022 is consistent with the global epidemic trend.
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Zhang Z, Chen Y, Li Q, Yang Y, Chen J, Lin Y, Xiao Z, Ma M, Wu C, Liu B, Xu R, Xiang J. Epidemiological characteristics of overseas imported COVID-19 cases into China: A scoping literature review. Front Public Health 2023; 11:1143468. [PMID: 37064698 PMCID: PMC10090422 DOI: 10.3389/fpubh.2023.1143468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 03/13/2023] [Indexed: 03/31/2023] Open
Abstract
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.
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Affiliation(s)
- Zitong Zhang
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Yifeng Chen
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Qingyu Li
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Yan Yang
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Jiake Chen
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Yan Lin
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Zhihong Xiao
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Marie Ma
- Magill Medical Center, Adelaide, SA, Australia
| | - Chuancheng Wu
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Baoying Liu
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Rongxian Xu
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Jianjun Xiang
- School of Public Health, Fujian Medical University, Fuzhou, Fujian Province, China
- *Correspondence: Jianjun Xiang,
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