Characteristics of individuals positive for SARS-CoV-2 nucleic acid in a centralized isolation site for people entering China
SHI Changmiao1, AO Xinhua2, SHAO Bin1, YANG Weifeng3, WANG Weihong4, TONG Zhaowei4, SHEN Jianyong5, YU Yuhui2
1. Administrative Office of Changxing Center for Disease Control and Prevention, Changxing, Zhejiang 313100, China; 2. Changxing Health Bureau, Changxing, Zhejiang 313100, China; 3. Changxing Maternal and Child Health Hospital, Changxing, Zhejiang 313100, China; 4. Huzhou Central Hospital, Huzhou, Zhejiang 313003, China; 5. Huzhou Center for Disease Control and Prevention, Huzhou, Zhejiang 313000, China
Abstract：Objective To analyze the characteristics of individuals positive for SARS-CoV-2 nucleic acid in a centralized isolation site for people entering China in Huzhou City of Zhejiang Province from December 18, 2021 to January 12, 2022, so as to provide insights into the prevention and control of overseas imported COVID-19. Methods The basic characteristics, nucleic acid detection and epidemiological investigations were collected from individuals positive for SARS-CoV-2 nucleic acid in a centralized isolation site for people entering China from December 18, 2021 to January 12, 2022, and the temporal distribution, population distribution, source of importation, and virus typing were descriptively analyzed. Results From December 18, 2021 to January 12, 2022, a total of 2 974 individuals in 19 flights were recorded in this centralized isolation site, and 33 cases were tested positive for SARS-CoV-2 nucleic acid, including 21 confirmed cases with common type, 9 confirmed cases with mild type, and 3 cases with asymptomatic infections. There were 11 cases with Omicron infections ( 33.33% ), 5 cases with Delta infections ( 15.15% ), and 17 cases with infection of unidentified types ( 51.52% ). The median interval ( interquartile range ) from the time of entry to the time of a positive test was 4.0 ( 7.0 ) days among all positive cases, 0 ( 4.0 ) day among cases with Omicron infections and 4.5 ( 8.5 ) days among cases with infections of Delta and unidentified types. The positive cases had a mean age of ( 36.97±8.58 ) years, and included 27 men (81.82%). There were 30 cases ( 90.91% ) receiving two and more doses of COVID-19 vaccines, and 7 cases ( 21.21% ) with a previous history of SARS-CoV-2 infections. There were 19 cases ( 57.58% ) from African countries, and 7 of 11 cases with Omicron infections were imported from African countries. Conclusion Omicron infection was predominant among individuals positive for SARS-CoV-2 nucleic acid in this centralized isolation site for people entering China from December 18, 2021 to January 12, 2022, with no severe cases detected, and most positive cases were imported from African countries.
施长苗, 敖新华, 邵斌, 杨卫锋, 王伟洪, 童照威, 沈建勇, 余育晖. 入境人员集中隔离点新型冠状病毒核酸检测阳性病例特征分析[J]. 预防医学, 2022, 34(4): 325-329.
SHI Changmiao, AO Xinhua, SHAO Bin, YANG Weifeng, WANG Weihong, TONG Zhaowei, SHEN Jianyong, YU Yuhui. Characteristics of individuals positive for SARS-CoV-2 nucleic acid in a centralized isolation site for people entering China. Preventive Medicine, 2022, 34(4): 325-329.
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