Cited by 214SARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research StudiesAnimal Virus Infections Studies

Neutralization of the SARS-CoV-2 Mu Variant by Convalescent and Vaccine Serum

Open access
Uriu, Keiya, Kimura, Izumi, Shirakawa, Kotaro, Takaori-Kondo, Akifumi, Nakada, Taka-aki, Kaneda, Atsushi, Nakagawa, So, Sato, Kei·2021·New England Journal of Medicine

Published version of a preprint

Abstract

Abstract On August 30, 2021, the WHO classified the SARS-CoV-2 Mu variant (B.1.621 lineage) as a new variant of interest. The WHO defines “comparative assessment of virus characteristics and public health risks” as primary action in response to the emergence of new SARS-CoV-2 variants. Here, we demonstrate that the Mu variant is highly resistant to sera from COVID-19 convalescents and BNT162b2-vaccinated individuals. Direct comparison of different SARS-CoV-2 spike proteins revealed that Mu spike is more resistant to serum-mediated neutralization than all other currently recognized variants of interest (VOI) and concern (VOC). This includes the Beta variant (B.1.351) that has been suggested to represent the most resistant variant to convalescent and vaccinated sera to date (e.g., Collier et al, Nature, 2021; Wang et al, Nature, 2021). Since breakthrough infection by newly emerging variants is a major concern during the current COVID-19 pandemic (Bergwerk et al., NEJM, 2021), we believe that our findings are of significant public health interest. Our results will help to better assess the risk posed by the Mu variant for vaccinated, previously infected and naïve populations.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1056/nejmc2114706

Cites

5 of 5 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Uriu, K., Kimura, I., Shirakawa, K., Takaori-Kondo, A., Nakada, T.-A., Kaneda, A., Nakagawa, S., & Sato, K.
Affiliations
  • The University of Tokyo (JP)
  • Kyoto University (JP)
  • Chiba University (JP)
  • Tokai University (JP)
Corresponding author
Sato, Kei
Venue
New England Journal of Medicine
Published
2021-12-16
Volume
385
Issue
25
Pages
2397-2399
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W3208271747
Cited by
214
References
4
Citations by year
2026: 2 · 2025: 9 · 2024: 14 · 2023: 39 · 2022: 120 · 2021: 30
FWCI
16.06
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Agency for Medical Research and Development (20fk0108451)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
Keywords
SARS-CoV-2, Mu variant, Omicron variant, neutralizing antibodies, convalescent serum, COVID-19 vaccines, vaccine-induced immunity, antibody neutralization
MeSH terms
COVID-19, SARS-CoV-2, BNT162 Vaccine, COVID-19 Serotherapy, Colombia, Humans, Immunization, Passive, Neutralization Tests, Antibodies, Neutralizing

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review