Comparison of Four SARS-CoV-2 Neutralization Assays
Open accessAbstract
Neutralizing antibodies are a major correlate of protection for many viruses including the novel coronavirus SARS-CoV-2. Thus, vaccine candidates should potently induce neutralizing antibodies to render effective protection from infection. A variety of in vitro assays for the detection of SARS-CoV-2 neutralizing antibodies has been described. However, validation of the different assays against each other is important to allow comparison of different studies. Here, we compared four different SARS-CoV-2 neutralization assays using the same set of patient samples. Two assays used replication competent SARS-CoV-2, a focus forming assay and a TCID50-based assay, while the other two assays used replication defective lentiviral or vesicular stomatitis virus (VSV)-based particles pseudotyped with SARS-CoV-2 spike. All assays were robust and produced highly reproducible neutralization titers. Titers of neutralizing antibodies correlated well between the different assays and with the titers of SARS-CoV-2 S-protein binding antibodies detected in an ELISA. Our study showed that commonly used SARS-CoV-2 neutralization assays are robust and that results obtained with different assays are comparable.
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The VSV pseudotype system faithfully mimics key aspects of SARS-CoV-2 entry, including ACE2 engagement, TMPRSS2 priming, and antibody-mediated neutralization.
“This system faithfully mimics key aspects of SARS-CoV-2 entry into cells, including ACE2 engagement, priming of the S protein by TMPRSS2, and antibody-mediated neutralization (Hoffmann et al., 2020b; Riepler et al., 2020; Schmidt et al., 2020).”
From SARS-CoV-2 variants B.1.351 and P.1 escape from neutralizing antibodies (2021) · cites this paper as Riepler et al., 2020
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- Authors
- Riepler, L., Rössler, A., Falch, A., Volland, A., Borena, W., von Laer, D., & Kimpel, J.
- Affiliations
- Innsbruck Medical University (AT)
- Department of Hygiene, Microbiology and Public Health, Institute of Virology, Medical University of Innsbruck, 6020 Innsbruck, Austria
- Corresponding author
- Kimpel, Janine
- Venue
- Vaccines
- Publisher
- MDPI AG
- Published
- 2020-12-28
- Volume
- 9
- Issue
- 1
- Pages
- 13
- ISSN
- 2076-393X (ISSN-L)
- PMC
- PMC7824240
- OpenAlex
- W3114250596
- Cited by
- 117
- References
- 26
- Citations by year
- 2026: 2 · 2025: 10 · 2024: 17 · 2023: 19 · 2022: 37 · 2021: 32
- FWCI
- 2.89
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Vaccines (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 detection and testing
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
- Keywords
- SARS-CoV-2, neutralizing antibodies, assay validation, TCID50, vaccine-induced immunity, assay reproducibility
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