Clinical Severity of SARS-CoV-2 Omicron Variant Compared with Delta among Hospitalized COVID-19 Patients in Belgium during Autumn and Winter Season 2021–2022

Nina van Goethem, Pui Yan Jenny Chung, Marjan Meurisse, Mathil Vandromme, Laurane de Mot, Ruben Brondeel, Veerle Stouten, Sofieke Klamer, Lize Cuypers, Toon Braeye, Lucy Catteau, Louis Nevejan, Joris A. F. van Loenhout, Koen Blot

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Abstract

This retrospective multi-center matched cohort study assessed the risk for severe COVID-19 (combination of severity indicators), intensive care unit (ICU) admission, and in-hospital mortality in hospitalized patients when infected with the Omicron variant compared to when infected with the Delta variant. The study is based on a causal framework using individually-linked data from national COVID-19 registries. The study population consisted of 954 COVID-19 patients (of which, 445 were infected with Omicron) above 18 years old admitted to a Belgian hospital during the autumn and winter season 2021–2022, and with available viral genomic data. Patients were matched based on the hospital, whereas other possible confounders (demographics, comorbidities, vaccination status, socio-economic status, and ICU occupancy) were adjusted for by using a multivariable logistic regression analysis. The estimated standardized risk for severe COVID-19 and ICU admission in hospitalized patients was significantly lower (RR = 0.63; 95% CI (0.30; 0.97) and RR = 0.56; 95% CI (0.14; 0.99), respectively) when infected with the Omicron variant, whereas in-hospital mortality was not significantly different according to the SARS-CoV-2 variant (RR = 0.78, 95% CI (0.28–1.29)). This study demonstrates the added value of integrated genomic and clinical surveillance to recognize the multifactorial nature of COVID-19 pathogenesis.
Original languageEnglish
Article number1297
JournalViruses
Volume14
Issue number6
DOIs
Publication statusPublished - 1 Jun 2022

Keywords

  • COVID-19
  • Delta
  • Omicron
  • SARS-CoV-2
  • genomic surveillance

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