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Abstract

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.

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/content/10.2807/1560-7917.ES.2021.26.50.2101147
2021-12-16
2024-11-23
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2021.26.50.2101147
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Outbreak caused by the SARS-CoV-2 Omicron variant in Norway, November to December 2021
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Lin+T.+Brandal&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Brandal Lin T.</a>, <a href="/search?value1=Emily+MacDonald&option1=author&noRedirect=true" class="nonDisambigAuthorLink">MacDonald Emily</a>, <a href="/search?value1=Lamprini+Veneti&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Veneti Lamprini</a>, <a href="/search?value1=Tine+Ravlo&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Ravlo Tine</a>, <a href="/search?value1=Heidi+Lange&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Lange Heidi</a>, <a href="/search?value1=Umaer+Naseer&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Naseer Umaer</a>, <a href="/search?value1=Siri+Feruglio&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Feruglio Siri</a>, <a href="/search?value1=Karoline+Bragstad&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Bragstad Karoline</a>, <a href="/search?value1=Olav+Hungnes&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Hungnes Olav</a>, <a href="/search?value1=Liz+E.+%C3%98deskaug&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Ødeskaug Liz E.</a>, <a href="/search?value1=Frode+Hagen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Hagen Frode</a>, <a href="/search?value1=Kristian+E.+Hanch-Hansen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Hanch-Hansen Kristian E.</a>, <a href="/search?value1=Andreas+Lind&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Lind Andreas</a>, <a href="/search?value1=Sara+Viksmoen+Watle&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Watle Sara Viksmoen</a>, <a href="/search?value1=Arne+M.+Taxt&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Taxt Arne M.</a>, <a href="/search?value1=Mia+Johansen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Johansen Mia</a>, <a href="/search?value1=Line+Vold&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Vold Line</a>, <a href="/search?value1=Preben+Aavitsland&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Aavitsland Preben</a>, <a href="/search?value1=Karin+Nyg%C3%A5rd&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Nygård Karin</a>, <a href="/search?value1=Elisabeth+H.+Madslien&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Madslien Elisabeth H.</a></span>. Outbreak caused by the SARS-CoV-2 Omicron variant in Norway, November to December 2021. <a href="/content/ecdc">Euro Surveill.</a> 2021;26(50):pii=2101147. <a href="https://doi.org/10.2807/1560-7917.ES.2021.26.50.2101147" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2021.26.50.2101147</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 10 Dec 2021;&nbsp;&nbsp; <span class="generated">Accepted</span>: 15 Dec 2021 </span> </p>
/content/10.2807/1560-7917.ES.2021.26.50.2101147
/content/10.2807/1560-7917.ES.2021.26.50.2101147
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