Infection- and vaccine-induced antibody binding and neutralization of the B.1.351 SARS-CoV-2 variant

Venkata Viswanadh Edara, Carson Norwood, Katharine Floyd, Lilin Lai, Meredith E. Davis-Gardner, William H. Hudson, Grace Mantus, Lindsay E. Nyhoff, Max W. Adelman, Rebecca Fineman, Shivan Patel, Rebecca Byram, Dumingu Nipuni Gomes, Garett Michael, Hayatu Abdullahi, Nour Beydoun, Bernadine Panganiban, Nina McNair, Kieffer Hellmeister, Jamila PittsJoy Winters, Jennifer Kleinhenz, Jacob Usher, James B. O'Keefe, Anne Piantadosi, Jesse J. Waggoner, Ahmed Babiker, David S. Stephens, Evan J. Anderson, Srilatha Edupuganti, Nadine Rouphael, Rafi Ahmed, Jens Wrammert, Mehul S. Suthar

Research output: Contribution to journalArticlepeer-review

125 Scopus citations


The emergence of SARS-CoV-2 variants with mutations in the spike protein is raising concerns about the efficacy of infection- or vaccine-induced antibodies. We compared antibody binding and live virus neutralization of sera from naturally infected and Moderna-vaccinated individuals against two SARS-CoV-2 variants: B.1 containing the spike mutation D614G and the emerging B.1.351 variant containing additional spike mutations and deletions. Sera from acutely infected and convalescent COVID-19 patients exhibited a 3-fold reduction in binding antibody titers to the B.1.351 variant receptor-binding domain of the spike protein and a 3.5-fold reduction in neutralizing antibody titers against SARS-CoV-2 B.1.351 variant compared to the B.1 variant. Similar results were seen with sera from Moderna-vaccinated individuals. Despite reduced antibody titers against the B.1.351 variant, sera from infected and vaccinated individuals containing polyclonal antibodies to the spike protein could still neutralize SARS-CoV-2 B.1.351, suggesting that protective humoral immunity may be retained against this variant.

Original languageEnglish (US)
Pages (from-to)516-521.e3
JournalCell Host and Microbe
Issue number4
StatePublished - Apr 14 2021


  • SARS-CoV-2
  • emerging variants
  • humoral immunity
  • receptor-binding domain
  • vaccine
  • viral neutralization

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Virology


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