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. 2021 Dec;26(50):2101146.
doi: 10.2807/1560-7917.ES.2021.26.50.2101146.

Epidemiological characterisation of the first 785 SARS-CoV-2 Omicron variant cases in Denmark, December 2021

Laura Espenhain  1 , Tjede Funk  1   2 , Maria Overvad  1 , Sofie Marie Edslev  3 , Jannik Fonager  4 , Anna Cäcilia Ingham  3 , Morten Rasmussen  4 , Sarah Leth Madsen  5 , Caroline Hjorth Espersen  1 , Raphael N Sieber  3 , Marc Stegger  3 , Vithiagaran Gunalan  4 , Bartlomiej Wilkowski  6   7 , Nicolai Balle Larsen  6 , Rebecca Legarth  1 , Arieh Sierra Cohen  6 , Finn Nielsen  8 , Janni Uyen Hoa Lam  8 , Kjetil Erdogan Lavik  8 , Marianne Karakis  8 , Katja Spiess  4 , Ellinor Marving  4 , Christian Nielsen  6   7 , Christina Wiid Svarrer  3 , Jonas Bybjerg-Grauholm  9 , Stefan Schytte Olsen  8 , Anders Jensen  6   7 , Tyra Grove Krause  10 , Luise Müller  1
Affiliations

Epidemiological characterisation of the first 785 SARS-CoV-2 Omicron variant cases in Denmark, December 2021

Laura Espenhain et al. Euro Surveill. 2021 Dec.

Abstract

By 9 December 2021, 785 SARS-CoV-2 Omicron variant cases have been identified in Denmark. Most cases were fully (76%) or booster-vaccinated (7.1%); 34 (4.3%) had a previous SARS-CoV-2 infection. The majority of cases with available information reported symptoms (509/666; 76%) and most were infected in Denmark (588/644; 91%). One in five cases cannot be linked to previous cases, indicating widespread community transmission. Nine cases have been hospitalised, one required intensive care and no deaths have been registered.

Keywords: COVID-19; Denmark; Omicron; SARS-CoV-2; epidemiology; laboratory; surveillance; viral infections.

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Conflict of interest statement

Conflict of interest: None declared.

Figures

Figure 1
Figure 1
Sample date for SARS-CoV-2 Omicron cases by suspected place of infection, Denmark, 22 November–7 December 2021, data as at 9 December 2021 (n = 785)
Figure 2
Figure 2
Maximum-likelihood phylogeny for consensus genomes from SARS-CoV-2 Omicron cases sequenced in Denmark as at 7 December 2021 (n = 92)
See this image and copyright information in PMC

References

    1. World Health Organization (WHO). Classification of Omicron (B.1.1.529): SARS-CoV-2 variant of concern. Geneva: WHO; 2021. Available from: https://www.who.int/news/item/26-11-2021-classification-of-omicron-(b.1....
    1. Statens Serum Institut (SSI). Covid-19 – Danmark (kommunalt). [COVID-19 Denmark (by municipality)]. Copenhagen: SSI. [Accessed: 9 Dec 2021]. Danish. Available from: https://experience.arcgis.com/experience/aa41b29149f24e20a4007a0c4e13db1...
    1. Statens Serum Institut (SSI). Covid-19 – Danmark (regionalt). [COVID-19 Denmark (by region)]. Copenhagen: SSI. [Accessed: 9 Dec 2021]. Danish. Available from: https://experience.arcgis.com/experience/aa41b29149f24e20a4007a0c4e13db1...
    1. Danish Covid-19 Genome Consortium. Genomic overview of SARS-CoV-2 in Denmark. Copenhagen: Statens Serum Institut. [Accessed: 14 December 2021]. Available from: https://www.covid19genomics.dk/statistics
    1. Spiess K, Gunalan V, Marving E, Nielsen SH, Jørgensen MGP, Fomsgaard AS, et al. Rapid surveillance platforms for key SARS-CoV-2 mutations in Denmark. medRxiv. 2021:2021.10.25.21265484. Preprint. https://doi.org/10.1101/2021.10.25.21265484

Supplementary concepts