Clinical and experimental evidence suggest omicron variant of SARS-CoV-2 is inherently less pathogenic than delta variant independent of previous immunity
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Published:2023-10-11
Issue:1
Volume:28
Page:
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ISSN:2047-783X
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Container-title:European Journal of Medical Research
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language:en
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Short-container-title:Eur J Med Res
Author:
Thiruvengadam Ramachandran,Rizvi Zaigham Abbas,Raghavan Sreevatsan,Murugesan Deepika Rathna,Gosain Mudita,Dandotiya Jyotsna,Ayushi ,Samal Sweety,Pandey Anil K.,Wadhwa Nitya,Bhatnagar Shinjini,Awasthi Amit,Garg Pramod Kumar
Abstract
Abstract
Objectives
To study clinical disease outcomes in both human and animal models to understand the pathogenicity of omicron compared to the delta variant.
Methods
In this cross-sectional observational study, clinical outcomes of adults who tested positive at 2 testing centres in Delhi National Capital Region between January 2022 and March 2022 (omicron-infected; N = 2998) were compared to a similar geographical cohort (delta-infected; N = 3292). In addition, disease course and outcomes were studied in SARS-CoV-2-infected golden Syrian hamsters and K-18 humanized ACE2 transgenic mice.
Results
Omicron variant infection was associated with a milder clinical course [83% (95% CI 61, 94) reduced risk of severity compared against delta] adjusting for vaccination, age, sex, prior infection and occupational risk. This correlated with lower disease index and vir comparing omicron with other variants in animal models.
Conclusions
Infections caused by the omicron variant were milder compared to those caused by the delta variant independent of previous immunity.
Funder
Department of Biotechnology, Ministry of Science and Technology, India Bill and Melinda Gates Foundation
Publisher
Springer Science and Business Media LLC
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