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Rev Med Virol. 2021 Jul 19;e2277. doi: 10.1002/rmv.2277. Epub 2021 Jul 19.

Potency of BNT162b2 and mRNA-1273 vaccine-induced neutralizing antibodies against severe acute respiratory syndrome-CoV-2 variants of concern: A systematic review of in vitro studies.

Reviews in medical virology

Maryam Noori, Seyed Aria Nejadghaderi, Shahnam Arshi, Kristin Carson-Chahhoud, Khalil Ansarin, Ali-Asghar Kolahi, Saeid Safiri

Affiliations

  1. Student Research Committee, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
  2. School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
  3. Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), Tehran, Iran.
  4. Social Determinants of Health Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
  5. Australian Centre for Precision Health, Allied Health and Human Performance, University of South Australia, South Australia, Australia.
  6. School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia.
  7. Rahat Breath and Sleep Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
  8. Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
  9. Department of Community Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.

PMID: 34286893 PMCID: PMC8420542 DOI: 10.1002/rmv.2277

Abstract

BNT162b2 and mRNA-1273 are two types of mRNA-based vaccine platforms that have received emergency use authorization. The emergence of novel severe acute respiratory syndrome (SARS-CoV-2) variants has raised concerns of reduced sensitivity to neutralization by their elicited antibodies. We aimed to systematically review the most recent in vitro studies evaluating the effectiveness of BNT162b2 and mRNA-1273 induced neutralizing antibodies against SARS-CoV-2 variants of concern. We searched PubMed, Scopus, and Web of Science in addition to bioRxiv and medRxiv with terms including 'SARS-CoV-2', 'BNT162b2', 'mRNA-1273', and 'neutralizing antibody' up to June 29, 2021. A modified version of the Consolidated Standards of Reporting Trials (CONSORT) checklist was used for assessing included study quality. A total 36 in vitro studies meeting the eligibility criteria were included in this systematic review. B.1.1.7 (Alpha), B.1.351 (Beta), P.1 (Gamma), and B.1.617.2 (Delta) are four SARS-CoV-2 variants that have recently been identified as variants of concern. Included studies implemented different methods regarding pseudovirus or live virus neutralization assays for measuring neutralization titres against utilized viruses. After two dose vaccination by BNT162b2 or mRNA-1273, the B.1.351 variant had the least sensitivity to neutralizing antibodies, while B.1.1.7 variant had the most sensitivity; that is, it was better neutralized relative to the comparator strain. P.1 and B.1.617.2 variants had an intermediate level of impaired naturalization activity of antibodies elicited by prior vaccination. Our review suggests that immune sera derived from vaccinated individuals might show reduced protection of individuals immunized with mRNA vaccines against more recent SARS-CoV-2 variants of concern.

© 2021 John Wiley & Sons Ltd.

Keywords: BNT162b2; SARS-CoV-2; mRNA-1273; neutralizing antibody; variants of concern

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