Increased risk of infection with SARS-CoV-2 Omicron BA.1 compared with Delta in vaccinated and previously infected individuals, the Netherlands, 22 November 2021 to 19 January 2022

Author:

Eggink Dirk1ORCID,Andeweg Stijn P1ORCID,Vennema Harry1,van Maarseveen Noortje23,Vermaas Klaas3,Vlaemynck Boris4,Schepers Raf4,van Gageldonk-Lafeber Arianne B1,van den Hof Susan1,Reusken Chantal BEM1,Knol Mirjam J1

Affiliation:

1. Center for Infectious Disease Control, WHO COVID-19 reference laboratory, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands

2. Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, the Netherlands

3. Saltro Diagnostic Center for Primary Care, Utrecht, The Netherlands

4. SYNLAB, Heppignies, Belgium

Abstract

Infections with the Omicron SARS-CoV-2 variant are rapidly increasing worldwide. Among 174,349 SARS-CoV-2-infected individuals (≥ 12 years), we observed an increased risk of S gene target failure, predictive of the Omicron variant, in vaccinated (odds ratio (OR): 3.6; 95% confidence interval (CI): 3.4–3.7) and previously infected individuals (OR: 4.2; 95% CI: 3.8–4.7) compared with infected naïve individuals. This suggests vaccine- or infection-induced immunity against SARS-CoV-2 infections is less effective against the Omicron than the Delta variant.

Publisher

European Centre for Disease Control and Prevention (ECDC)

Subject

Virology,Public Health, Environmental and Occupational Health,Epidemiology

Reference26 articles.

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2. European Centre for Disease Prevention and Control (ECDC). Epidemiological update: Omicron variant of concern (VOC) – data as of 16 December 2021 (12:00). Stockholm: ECDC; 2021. Available from: https://www.ecdc.europa.eu/en/news-events/epidemiological-update-omicron-data-16-december

3. Barnard RC, Davies N, Pearson CAB, Jit M, Edmunds J. Modelling the potential consequences of the Omicron SARS-CoV-2 variant in England | Centre for Mathematical Modelling of Infectious Diseases Repository. London: London School of Hygiene & Tropical Medicine; 2021. Preprint. Available from: https://cmmid.github.io/topics/covid19/omicron-england.html

4. European Centre for Disease Prevention and Control (ECDC). Weekly epidemiological update: Omicron variant of concern (VOC) – week 2 (data as of 20 January 2022) EU/EEA. Stockholm: ECDC; 2022. Available from: https://www.ecdc.europa.eu/en/news-events/weekly-epidemiological-update-omicron-variant-concern-voc-week-2-data-20-january-2022

5. Omicron extensively but incompletely escapes Pfizer BNT162b2 neutralization.;Cele;Nature,2021

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