Outbreak caused by the SARS-CoV-2 Omicron variant in Norway, November to December 2021

In late November 2021, an outbreak of Omicron SARS-CoV-2 following a Christmas party with 117 attendees was detected in Oslo, Norway. We observed an attack rate of 74% and most cases developed symptoms. As at 13 December, none have been hospitalised. Most participants were 30-50 years old. Ninety-si...

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Bibliographic Details
Published in:Euro surveillance : bulletin européen sur les maladies transmissibles 2021-12, Vol.26 (50), p.1
Main Authors: Brandal, Lin T, MacDonald, Emily, Veneti, Lamprini, Ravlo, Tine, Lange, Heidi, Naseer, Umaer, Feruglio, Siri, Bragstad, Karoline, Hungnes, Olav, Ødeskaug, Liz E, Hagen, Frode, Hanch-Hansen, Kristian E, Lind, Andreas, Watle, Sara Viksmoen, Taxt, Arne M, Johansen, Mia, Vold, Line, Aavitsland, Preben, Nygård, Karin, Madslien, Elisabeth H
Format: Article
Language:English
Subjects:
Adult
Antibodies
COVID-19
COVID-19 vaccines
Disease control
Disease Outbreaks
Humans
Middle Aged
Norway - epidemiology
Rapid Communication
SARS-CoV-2
Severe acute respiratory syndrome coronavirus 2
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Summary:In late November 2021, an outbreak of Omicron SARS-CoV-2 following a Christmas party with 117 attendees was detected in Oslo, Norway. We observed an attack rate of 74% and most cases developed symptoms. As at 13 December, none have been hospitalised. Most participants were 30-50 years old. Ninety-six percent of them were fully vaccinated. These findings corroborate reports that the Omicron variant may be more transmissible, and that vaccination may be less effective in preventing infection compared with Delta.
ISSN:1560-7917
1025-496X
1560-7917
DOI:10.2807/1560-7917.es.2021.26.50.2101147