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

Author:

Brandal Lin T.1,MacDonald Emily1,Veneti Lamprini1,Ravlo Tine2,Lange Heidi1,Naseer Umaer1,Feruglio Siri1,Bragstad Karoline1,Hungnes Olav1,Ødeskaug Liz E.1,Hagen Frode2,Hanch-Hansen Kristian E.2,Lind Andreas3,Watle Sara Viksmoen1,Taxt Arne M.1,Johansen Mia1,Vold Line1,Aavitsland Preben1,Nygård Karin1,Madslien Elisabeth H.1

Affiliation:

1. Norwegian Institute of Public Health, Oslo, Norway

2. Municipality of Oslo, Norway

3. Department of Microbiology, Oslo University Hospital, Oslo, Norway

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.

Publisher

European Centre for Disease Control and Prevention (ECDC)

Subject

Virology,Public Health, Environmental and Occupational Health,Epidemiology

Reference16 articles.

1. World Health Organization (WHO). Classification of Omicron (B.1.1.529): SARS-CoV-2 Variant of Concern. Geneva: WHO. [Accessed: 6 Dec 2021]. Available from: https://www.who.int/news/item/26-11-2021-classification-of-omicron-(b.1.1.529)-sars-cov-2-variant-of-concern

2. European Centre for Disease Prevention and Control (ECDC). Threat Assessment Brief: Implications of the further emergence and spread of the SARS CoV 2 B.1.1.529 variant of concern (Omicron) for the EU/EEA first update. Stockholm: ECDC. [Accessed: 6 Dec 2021]. Available from: https://www.ecdc.europa.eu/en/publications-data/covid-19-threat-assessment-spread-omicron-first-update

3. Norwegian Institute of Public Health (NIPH). Spesifikke TISK-tiltak for omikronvarianten. [Specific testing, isolation, contact tracing and quarantine (TISK) measures for the Omicron variant]. Oslo: FHI. [Accessed: 8 Dec 2021]. Norwegian. Available from: https://www.fhi.no/nettpub/coronavirus/testing/tisk/?term=&h=1#spesifikke-tisktiltak-for-omikronvarianten

4. United Kingdom Health Security Agency. Risk assessment for SARS-CoV_2 variant: Omicron VOC-21NOV-01 (B.1.1.529). London: UK Health Security Agency. [Accessed: 8 Dec 2021]. Available from: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1038442/3_December-2021-risk-assessment-for-SARS_Omicron_VOC-21NOV-01_B.1.1.529.pdf

5. Outbreak of SARS-CoV-2 Infections, Including COVID-19 Vaccine Breakthrough Infections, Associated with Large Public Gatherings - Barnstable County, Massachusetts, July 2021.;Brown;MMWR Morb Mortal Wkly Rep,2021

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