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
- Kristoffersen, Anja Bråthen
- Stålcrantz, Jeanette
- Bragstad, Karoline
- Hungnes, Olav
- Storm, Margrethe Larsdatter
- Aasand, Nina Therese
- Rø, Gunnar Øyvind Isaksson
- Starrfelt, Jostein
- Seppälä, Elina Marjukka
- Kvåle, Reidar
- Vold, Line
- Nygård, Karin
- Buanes, Eirik Alnes
- Whittaker, Robert Neil
Publication date
January 2022
DOI Publisher
European Centre for Disease Control and Prevention (ECDC) Language
EnglishAbstract
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%).publishedVersio
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