tetano
Editor, Senior Moderator
J Med Virol
. 2021 Jan 19.
doi: 10.1002/jmv.26805. Online ahead of print.
The effectiveness of active surveillance measures for COVID-19 cases in Pudong New Area Shanghai, China, 2020
Hanzhao Liu[SUP] 1 2 [/SUP], Chuchu Ye[SUP] 1 2 [/SUP], Yuanping Wang[SUP] 1 2 [/SUP], Weiping Zhu[SUP] 1 2 [/SUP], Yifeng Shen[SUP] 1 2 [/SUP], Caoyi Xue[SUP] 1 2 [/SUP], Hong Zhang[SUP] 1 2 [/SUP], Yanyan Zhang[SUP] 1 2 [/SUP], Shihong Li[SUP] 1 2 [/SUP], Bing Zhao[SUP] 1 2 [/SUP], Hongmei Xu[SUP] 1 2 [/SUP], Lipeng Hao[SUP] 1 2 [/SUP], Yixin Zhou[SUP] 1 2 [/SUP]
Affiliations
Abstract
Objective: The aim of this study was to thoroughly document the effects of multiple intervention and control methods to mitigate the ongoing coronavirus disease 2019 (COVID-19) outbreak in Pudong New Area, Shanghai.
Methods: After identification of the first confirmed case of COVID-19 in Pudong, on January 21, 2020, the local Center for Disease Control (CDC) launched a case investigation involving isolation, close-contact (CC) tracing, and quarantine of persons with a potential exposure risk to prevent and control transmission. Epidemiological features of cases detected by three different strategies were compared to assess the impact of these active surveillance measures.
Results: As of February 16, 2020, a total of 108 confirmed COVID-19 cases had been identified in Pudong, Shanghai. Forty-five (41.67%) cases were identified through active surveillance measures, with 22 (20.37%) identified by CC tracing and 23 (21.30%) by quarantine of potential exposure populations (PEPs). The average interval from illness onset to the first medical visit was 1 day. Cases identified by CC tracing and PEPs were quarantined for 0.5 and 1 day before illness onset, respectively. The time intervals from illness onset to the first medical visit and isolation among actively screened cases were 2 days (p=0.02) and 3 days (p=0.00) shorter, respectively, than those among self-admission cases.
Conclusions: Our study highlights the importance of active surveillance for potential COVID-19 cases, as demonstrated by shortened time intervals from illness onset to both the first medical visit and isolation. These measures contributed to effective control of COVID-19 outbreak in Pudong, Shanghai. This article is protected by copyright. All rights reserved.
Keywords: COVID-19; close contacts; potential exposure populations; quarantine; surveillance.
. 2021 Jan 19.
doi: 10.1002/jmv.26805. Online ahead of print.
The effectiveness of active surveillance measures for COVID-19 cases in Pudong New Area Shanghai, China, 2020
Hanzhao Liu[SUP] 1 2 [/SUP], Chuchu Ye[SUP] 1 2 [/SUP], Yuanping Wang[SUP] 1 2 [/SUP], Weiping Zhu[SUP] 1 2 [/SUP], Yifeng Shen[SUP] 1 2 [/SUP], Caoyi Xue[SUP] 1 2 [/SUP], Hong Zhang[SUP] 1 2 [/SUP], Yanyan Zhang[SUP] 1 2 [/SUP], Shihong Li[SUP] 1 2 [/SUP], Bing Zhao[SUP] 1 2 [/SUP], Hongmei Xu[SUP] 1 2 [/SUP], Lipeng Hao[SUP] 1 2 [/SUP], Yixin Zhou[SUP] 1 2 [/SUP]
Affiliations
- PMID: 33463732
- DOI: 10.1002/jmv.26805
Abstract
Objective: The aim of this study was to thoroughly document the effects of multiple intervention and control methods to mitigate the ongoing coronavirus disease 2019 (COVID-19) outbreak in Pudong New Area, Shanghai.
Methods: After identification of the first confirmed case of COVID-19 in Pudong, on January 21, 2020, the local Center for Disease Control (CDC) launched a case investigation involving isolation, close-contact (CC) tracing, and quarantine of persons with a potential exposure risk to prevent and control transmission. Epidemiological features of cases detected by three different strategies were compared to assess the impact of these active surveillance measures.
Results: As of February 16, 2020, a total of 108 confirmed COVID-19 cases had been identified in Pudong, Shanghai. Forty-five (41.67%) cases were identified through active surveillance measures, with 22 (20.37%) identified by CC tracing and 23 (21.30%) by quarantine of potential exposure populations (PEPs). The average interval from illness onset to the first medical visit was 1 day. Cases identified by CC tracing and PEPs were quarantined for 0.5 and 1 day before illness onset, respectively. The time intervals from illness onset to the first medical visit and isolation among actively screened cases were 2 days (p=0.02) and 3 days (p=0.00) shorter, respectively, than those among self-admission cases.
Conclusions: Our study highlights the importance of active surveillance for potential COVID-19 cases, as demonstrated by shortened time intervals from illness onset to both the first medical visit and isolation. These measures contributed to effective control of COVID-19 outbreak in Pudong, Shanghai. This article is protected by copyright. All rights reserved.
Keywords: COVID-19; close contacts; potential exposure populations; quarantine; surveillance.