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Genomic assessment of quarantine measures to prevent SARS-CoV-2 importation and transmission.

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Title: Genomic assessment of quarantine measures to prevent SARS-CoV-2 importation and transmission.
Authors: Aggarwal, Dinesh, Page, Andrew J., Schaefer, Ulf, Savva, George M., Myers, Richard, Volz, Erik, Ellaby, Nicholas, Platt, Steven, Groves, Natalie, Gallagher, Eileen, Tumelty, Niamh M., Le Viet, Thanh, Hughes, Gareth J., Chen, Cong, Turner, Charlie, Logan, Sophie, Harrison, Abbie, The COVID-19 Genomics UK (COG-UK) Consortium, Koshy, Cherian, Ash, Amy
Source: Nature Communications; 2/23/2022, Vol. 13 Issue 1, p1-13, 13p
Subject Terms: SARS-CoV-2, QUARANTINE, CONTACT tracing, INTERNATIONAL travel, MITOCHONDRIAL DNA abnormalities
Geographic Terms: ENGLAND
Abstract: Mitigation of SARS-CoV-2 transmission from international travel is a priority. We evaluated the effectiveness of travellers being required to quarantine for 14-days on return to England in Summer 2020. We identified 4,207 travel-related SARS-CoV-2 cases and their contacts, and identified 827 associated SARS-CoV-2 genomes. Overall, quarantine was associated with a lower rate of contacts, and the impact of quarantine was greatest in the 16–20 age-group. 186 SARS-CoV-2 genomes were sufficiently unique to identify travel-related clusters. Fewer genomically-linked cases were observed for index cases who returned from countries with quarantine requirement compared to countries with no quarantine requirement. This difference was explained by fewer importation events per identified genome for these cases, as opposed to fewer onward contacts per case. Overall, our study demonstrates that a 14-day quarantine period reduces, but does not completely eliminate, the onward transmission of imported cases, mainly by dissuading travel to countries with a quarantine requirement. Post-international travel quarantine has been widely implemented to mitigate SARS-CoV-2 transmission, but the impacts of such policies are unclear. Here, the authors used linked genomic and contact tracing data to assess the impacts of a 14-day quarantine on return to England in summer 2020. [ABSTRACT FROM AUTHOR]
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Database: Complementary Index
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Abstract:Mitigation of SARS-CoV-2 transmission from international travel is a priority. We evaluated the effectiveness of travellers being required to quarantine for 14-days on return to England in Summer 2020. We identified 4,207 travel-related SARS-CoV-2 cases and their contacts, and identified 827 associated SARS-CoV-2 genomes. Overall, quarantine was associated with a lower rate of contacts, and the impact of quarantine was greatest in the 16–20 age-group. 186 SARS-CoV-2 genomes were sufficiently unique to identify travel-related clusters. Fewer genomically-linked cases were observed for index cases who returned from countries with quarantine requirement compared to countries with no quarantine requirement. This difference was explained by fewer importation events per identified genome for these cases, as opposed to fewer onward contacts per case. Overall, our study demonstrates that a 14-day quarantine period reduces, but does not completely eliminate, the onward transmission of imported cases, mainly by dissuading travel to countries with a quarantine requirement. Post-international travel quarantine has been widely implemented to mitigate SARS-CoV-2 transmission, but the impacts of such policies are unclear. Here, the authors used linked genomic and contact tracing data to assess the impacts of a 14-day quarantine on return to England in summer 2020. [ABSTRACT FROM AUTHOR]
ISSN:20411723
DOI:10.1038/s41467-022-28371-z