Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022

We included 39,524 COVID-19 Omicron and 51,481 Delta cases reported in Norway from December 2021 to January 2022. We estimated a 73% reduced risk of hospitalisation (adjusted hazard ratio: 0.27; 95% confidence interval: 0.20–0.36) for Omicron compared with Delta. Compared with unvaccinated groups, O...

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Autores principales: Veneti, Lamprini, Bøås, Håkon, Bråthen Kristoffersen, Anja, Stålcrantz, Jeanette, Bragstad, Karoline, Hungnes, Olav, Storm, Margrethe Larsdatter, Aasand, Nina, Rø, Gunnar, Starrfelt, Jostein, Seppälä, Elina, Kvåle, Reidar, Vold, Line, Nygård, Karin, Buanes, Eirik Alnes, Whittaker, Robert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: European Centre for Disease Prevention and Control (ECDC) 2022
Materias:
Rapid Communication
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8796289/
https://www.ncbi.nlm.nih.gov/pubmed/35086614
http://dx.doi.org/10.2807/1560-7917.ES.2022.27.4.2200077
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author Veneti, Lamprini
Bøås, Håkon
Bråthen Kristoffersen, Anja
Stålcrantz, Jeanette
Bragstad, Karoline
Hungnes, Olav
Storm, Margrethe Larsdatter
Aasand, Nina
Rø, Gunnar
Starrfelt, Jostein
Seppälä, Elina
Kvåle, Reidar
Vold, Line
Nygård, Karin
Buanes, Eirik Alnes
Whittaker, Robert
author_facet Veneti, Lamprini
Bøås, Håkon
Bråthen Kristoffersen, Anja
Stålcrantz, Jeanette
Bragstad, Karoline
Hungnes, Olav
Storm, Margrethe Larsdatter
Aasand, Nina
Rø, Gunnar
Starrfelt, Jostein
Seppälä, Elina
Kvåle, Reidar
Vold, Line
Nygård, Karin
Buanes, Eirik Alnes
Whittaker, Robert
author_sort Veneti, Lamprini
collection PubMed
description We included 39,524 COVID-19 Omicron and 51,481 Delta cases reported in Norway from December 2021 to January 2022. We estimated a 73% reduced risk of hospitalisation (adjusted hazard ratio: 0.27; 95% confidence interval: 0.20–0.36) for Omicron compared with Delta. Compared with unvaccinated groups, Omicron cases who had completed primary two-dose vaccination 7–179 days before diagnosis had a lower reduced risk than Delta (66% vs 93%). People vaccinated with three doses had a similar risk reduction (86% vs 88%).
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spelling pubmed-87962892022-02-22 Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022 Veneti, Lamprini Bøås, Håkon Bråthen Kristoffersen, Anja Stålcrantz, Jeanette Bragstad, Karoline Hungnes, Olav Storm, Margrethe Larsdatter Aasand, Nina Rø, Gunnar Starrfelt, Jostein Seppälä, Elina Kvåle, Reidar Vold, Line Nygård, Karin Buanes, Eirik Alnes Whittaker, Robert Euro Surveill Rapid Communication We included 39,524 COVID-19 Omicron and 51,481 Delta cases reported in Norway from December 2021 to January 2022. We estimated a 73% reduced risk of hospitalisation (adjusted hazard ratio: 0.27; 95% confidence interval: 0.20–0.36) for Omicron compared with Delta. Compared with unvaccinated groups, Omicron cases who had completed primary two-dose vaccination 7–179 days before diagnosis had a lower reduced risk than Delta (66% vs 93%). People vaccinated with three doses had a similar risk reduction (86% vs 88%). European Centre for Disease Prevention and Control (ECDC) 2022-01-27 /pmc/articles/PMC8796289/ /pubmed/35086614 http://dx.doi.org/10.2807/1560-7917.ES.2022.27.4.2200077 Text en This article is copyright of the authors or their affiliated institutions, 2022. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0) Licence. You may share and adapt the material, but must give appropriate credit to the source, provide a link to the licence, and indicate if changes were made.
spellingShingle Rapid Communication
Veneti, Lamprini
Bøås, Håkon
Bråthen Kristoffersen, Anja
Stålcrantz, Jeanette
Bragstad, Karoline
Hungnes, Olav
Storm, Margrethe Larsdatter
Aasand, Nina
Rø, Gunnar
Starrfelt, Jostein
Seppälä, Elina
Kvåle, Reidar
Vold, Line
Nygård, Karin
Buanes, Eirik Alnes
Whittaker, Robert
Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022
title Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022
title_full Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022
title_fullStr Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022
title_full_unstemmed Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022
title_short Reduced risk of hospitalisation among reported COVID-19 cases infected with the SARS-CoV-2 Omicron BA.1 variant compared with the Delta variant, Norway, December 2021 to January 2022
title_sort reduced risk of hospitalisation among reported covid-19 cases infected with the sars-cov-2 omicron ba.1 variant compared with the delta variant, norway, december 2021 to january 2022
topic Rapid Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8796289/
https://www.ncbi.nlm.nih.gov/pubmed/35086614
http://dx.doi.org/10.2807/1560-7917.ES.2022.27.4.2200077
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