HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Considerable escape of SARS-CoV-2 Omicron to antibody neutralization

Abstract : The SARS-CoV-2 Omicron variant was first identified in November 2021 in Botswana and South Africa1-3. It has since spread to many countries and is expected to rapidly become dominant worldwide. The lineage is characterized by the presence of around 32 mutations in spike-located mostly in the N-terminal domain and the receptor-binding domain-that may enhance viral fitness and enable antibody evasion. Here we isolated an infectious Omicron virus in Belgium from a traveller returning from Egypt. We examined its sensitivity to nine monoclonal antibodies that have been clinically approved or are in development4, and to antibodies present in 115 serum samples from COVID-19 vaccine recipients or individuals who have recovered from COVID-19. Omicron was completely or partially resistant to neutralization by all monoclonal antibodies tested. Sera from recipients of the Pfizer or AstraZeneca vaccine, sampled five months after complete vaccination, barely inhibited Omicron. Sera from COVID-19-convalescent patients collected 6 or 12 months after symptoms displayed low or no neutralizing activity against Omicron. Administration of a booster Pfizer dose as well as vaccination of previously infected individuals generated an anti-Omicron neutralizing response, with titres 6-fold to 23-fold lower against Omicron compared with those against Delta. Thus, Omicron escapes most therapeutic monoclonal antibodies and, to a large extent, vaccine-elicited antibodies. However, Omicron is neutralized by antibodies generated by a booster vaccine dose.
Document type :
Journal articles
Complete list of metadata

https://hal-pasteur.archives-ouvertes.fr/pasteur-03654259
Contributor : Isma Ziani Connect in order to contact the contributor
Submitted on : Thursday, April 28, 2022 - 2:46:31 PM
Last modification on : Friday, May 6, 2022 - 2:54:41 PM

Links full text

Identifiers

Citation

Delphine Planas, Nell Saunders, Piet Maes, Florence Guivel-Benhassine, Cyril Planchais, et al.. Considerable escape of SARS-CoV-2 Omicron to antibody neutralization. Nature, Nature Publishing Group, 2022, 602 (7898), pp.671-675. ⟨10.1038/s41586-021-04389-z⟩. ⟨pasteur-03654259⟩

Share

Metrics

Record views

0