Relative Hypercoagulopathy of the SARS-CoV-2 Beta and Delta Variants when Compared to the Less Severe Omicron Variants Is Related to TEG Parameters, the Extent of Fibrin Amyloid Microclots, and the Severity of Clinical Illness


Grobbelaar, Lize M, Kruger, Arneaux, Venter, Chantelle, Burger, Este M, Laubscher, Gert J, Maponga, Tongai G, Kotze, Maritha J, Kwaan, Hau C, Miller, Joseph B, Fulkerson, Daniel et al (show 12 more authors) (2022) Relative Hypercoagulopathy of the SARS-CoV-2 Beta and Delta Variants when Compared to the Less Severe Omicron Variants Is Related to TEG Parameters, the Extent of Fibrin Amyloid Microclots, and the Severity of Clinical Illness. SEMINARS IN THROMBOSIS AND HEMOSTASIS, 48 (07). pp. 858-868.

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Abstract

Earlier variants of SARS-CoV-2 have been associated with hypercoagulability and an extensive formation of fibrin amyloid microclots, which are considered to contribute to the pathology of the coronavirus 2019 disease (COVID-19). The newer omicron variants appear to be far more transmissible, but less virulent, even when taking immunity acquired from previous infections or vaccination into account. We here show that while the clotting parameters associated with omicron variants are significantly raised over those of healthy, matched controls, they are raised to levels significantly lower than those seen with more severe variants such as beta and delta. We also observed that individuals infected with omicron variants manifested less extensive microclot formation in platelet-poor plasma compared with those harboring the more virulent variants. The measurement of clotting effects between the different variants acts as a kind of "internal control" that demonstrates the relationship between the extent of coagulopathies and the virulence of the variant of interest. This adds to the evidence that microclots may play an important role in reflecting the severity of symptoms observed in COVID-19.

Item Type: Article
Uncontrolled Keywords: coagulation, COVID-19, fluorescence microscopy, microclots, Omicron, variants
Divisions: Faculty of Health and Life Sciences
Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User: Symplectic Admin
Date Deposited: 18 Oct 2022 08:18
Last Modified: 29 Sep 2023 01:30
DOI: 10.1055/s-0042-1756306
Open Access URL: https://www.researchsquare.com/article/rs-1970823/...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3165536
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