Striking antibody evasion manifested by the Omicron variant of SARS-CoV-2

• Published in: Nature (London) Vol. 602; no. 7898; pp. 676 - 681
• Main Authors: Liu, Lihong, Iketani, Sho, Guo, Yicheng, Chan, Jasper F.-W., Wang, Maple, Liu, Liyuan, Luo, Yang, Chu, Hin, Huang, Yiming, Nair, Manoj S., Yu, Jian, Chik, Kenn K.-H., Yuen, Terrence T.-T., Yoon, Chaemin, To, Kelvin K.-W., Chen, Honglin, Yin, Michael T., Sobieszczyk, Magdalena E., Huang, Yaoxing, Wang, Harris H., Sheng, Zizhang, Yuen, Kwok-Yung, Ho, David D.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 24-02-2022; Nature Publishing Group
• Subjects: 13/1; 13/106; 631/250/590; 631/326/596/4130; Antibodies, Monoclonal - immunology; Antibodies, Neutralizing - blood; Antibodies, Neutralizing - immunology; Antibodies, Viral - blood; Antibodies, Viral - immunology; Cell Line; Convalescence; Coronaviruses; COVID-19; COVID-19 - blood; COVID-19 - immunology; COVID-19 - virology; COVID-19 vaccines; COVID-19 Vaccines - administration & dosage; COVID-19 Vaccines - immunology; Disease transmission; Epitopes; Evolution, Molecular; Humanities and Social Sciences; Humans; Immune Evasion - immunology; Immune Sera - immunology; Immunization; Infections; Inhibitory Concentration 50; Models, Molecular; Monoclonal antibodies; mRNA; multidisciplinary; Mutation; Neutralization; Neutralization Tests; Proteins; SARS-CoV-2 - chemistry; SARS-CoV-2 - classification; SARS-CoV-2 - genetics; SARS-CoV-2 - immunology; Science; Science (multidisciplinary); Severe acute respiratory syndrome coronavirus 2; Spike Glycoprotein, Coronavirus - chemistry; Spike Glycoprotein, Coronavirus - genetics; Spike Glycoprotein, Coronavirus - immunology; Spike protein; Vaccines; Africa
• ISSN: 0028-0836; 1476-4687
• DOI: 10.1038/s41586-021-04388-0

The B.1.1.529/Omicron variant of SARS-CoV-2 was only recently detected in southern Africa, but its subsequent spread has been extensive, both regionally and globally
1
. It is expected to become dominant in the coming weeks
2
, probably due to enhanced transmissibility. A striking feature of this variant is the large number of spike mutations
3
that pose a threat to the efficacy of current COVID-19 vaccines and antibody therapies
4
. This concern is amplified by the findings of our study. Here we found that B.1.1.529 is markedly resistant to neutralization by serum not only from patients who recovered from COVID-19, but also from individuals who were vaccinated with one of the four widely used COVID-19 vaccines. Even serum from individuals who were vaccinated and received a booster dose of mRNA-based vaccines exhibited substantially diminished neutralizing activity against B.1.1.529. By evaluating a panel of monoclonal antibodies against all known epitope clusters on the spike protein, we noted that the activity of 17 out of the 19 antibodies tested were either abolished or impaired, including ones that are currently authorized or approved for use in patients. Moreover, we also identified four new spike mutations (S371L, N440K, G446S and Q493R) that confer greater antibody resistance on B.1.1.529. The Omicron variant presents a serious threat to many existing COVID-19 vaccines and therapies, compelling the development of new interventions that anticipate the evolutionary trajectory of SARS-CoV-2.
The B.1.1.529/Omicron variant of SARS-CoV-2 is resistant to neutralization by serum not only from patients who recovered from COVID-19, but also from individuals vaccinated with one of the four widely used COVID-19 vaccines.