Cited by 1,523SARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research StudiesImmune responses and vaccinations

Safety and Immunogenicity of SARS-CoV-2 mRNA-1273 Vaccine in Older Adults

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Anderson, Evan J., Rouphael, Nadine G., Widge, Alicia T., Jackson, Lisa A., Roberts, Paul C., Makhene, Mamodikoe, Chappell, James D., Denison, Mark R. +29 more·2020·New England Journal of Medicine

Abstract

BACKGROUND: Testing of vaccine candidates to prevent infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in an older population is important, since increased incidences of illness and death from coronavirus disease 2019 (Covid-19) have been associated with an older age. METHODS: We conducted a phase 1, dose-escalation, open-label trial of a messenger RNA vaccine, mRNA-1273, which encodes the stabilized prefusion SARS-CoV-2 spike protein (S-2P) in healthy adults. The trial was expanded to include 40 older adults, who were stratified according to age (56 to 70 years or ≥71 years). All the participants were assigned sequentially to receive two doses of either 25 μg or 100 μg of vaccine administered 28 days apart. RESULTS: Solicited adverse events were predominantly mild or moderate in severity and most frequently included fatigue, chills, headache, myalgia, and pain at the injection site. Such adverse events were dose-dependent and were more common after the second immunization. Binding-antibody responses increased rapidly after the first immunization. By day 57, among the participants who received the 25-μg dose, the anti-S-2P geometric mean titer (GMT) was 323,945 among those between the ages of 56 and 70 years and 1,128,391 among those who were 71 years of age or older; among the participants who received the 100-μg dose, the GMT in the two age subgroups was 1,183,066 and 3,638,522, respectively. After the second immunization, serum neutralizing activity was detected in all the participants by multiple methods. Binding- and neutralizing-antibody responses appeared to be similar to those previously reported among vaccine recipients between the ages of 18 and 55 years and were above the median of a panel of controls who had donated convalescent serum. The vaccine elicited a strong CD4 cytokine response involving type 1 helper T cells. CONCLUSIONS: In this small study involving older adults, adverse events associated with the mRNA-1273 vaccine were mainly mild or moderate. The 100-μg dose induced higher binding- and neutralizing-antibody titers than the 25-μg dose, which supports the use of the 100-μg dose in a phase 3 vaccine trial. (Funded by the National Institute of Allergy and Infectious Diseases and others; mRNA-1273 Study ClinicalTrials.gov number, NCT04283461.).

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Crossref · 10.1056/nejmoa2028436

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  • S-2P differs from the spike protein in the reference SARS-CoV-2 genome (NC_045512) by two amino acids, i.e., amino acids KV at sites 986 and 987 were replaced by PP.

    “Both mRNA encodes the same S-2P protein [5,6] which differ from the spike protein in the reference SARS-CoV-2 genome (NC_045512) by two amino acids, i.e., amino acids KV at sites 986 and 987 were replaced by PP to stabilize the resulting spike protein in the prefusion state to train the host immune system to recognize the virus before its entry into the host cell [7,8].”

    From Detailed Dissection and Critical Evaluation of the Pfizer/BioNTech and Moderna mRNA Vaccines (2021) · cites this paper as [5]

    The Methods section (‘mRNA-1273 Vaccine’; page not provided) says S-2P contains two proline substitutions, and the Discussion describes them as prefusion-stabilizing mutations. Our copy does not identify the original residues as KV, give positions 986 and 987, or specify the reference genome accession NC_045512. (LLM, conf=0.87)

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  • The reactogenicity associated with immunization with mRNA-1273 in this trial is similar to that in the phase 1 data reported previously.

    “The reactogenicity associated with immunization with mRNA-1273 in this trial is similar to that in the phase 1 data reported previously. 1,4”

    From Efficacy and Safety of the mRNA-1273 SARS-CoV-2 Vaccine (2021) · cites this paper as [4]

  • The mRNA-1273 vaccine demonstrated protection in animal-challenge experiments and encouraging safety and immunogenicity in early-stage human testing.

    “The mRNA-1273 vaccine demonstrated protection in animal-challenge experiments 15 and encouraging safety and immunogenicity in early-stage human testing. 1,4”

    From Efficacy and Safety of the mRNA-1273 SARS-CoV-2 Vaccine (2021) · cites this paper as [4]

  • mRNA-1273 produced TH1 cell responses after the first dose, with 0.05% of circulating CD4+ T cells releasing TNF and/or IL-2 after in vitro stimulation with S protein peptides.

    “mRNA-1273 was shown to elicit TH1 cell responses after the first dose, with 0.05% of circulating CD4+ T cells secreting tumour necrosis factor (TNF) and/or interleukin-2 (IL-2) following in vitro stimulation with S protein peptides73 (Table 1; see Supplementary Table 1);”
  • By late 2020, two mRNA vaccines had been authorized in the US, UK, Israel, and EU, with millions vaccinated.

    “Based on results from phase-III vaccine trials utilizing mRNA vaccines (Anderson et al., 2020; Polack et al., 2020), two vaccines have been approved in the United States, United Kingdom, Israel, and the European Union, and several million individuals have been vaccinated since late 2020.”

    From COVID-19 and the human innate immune system (2021) · cites this paper as Anderson et al., 2020

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Research works printed but not linked: 3

  1. [4]Corbett KS, Edwards D, Leist SR, et al. SARS-CoV-2 mRNA vaccine development enabled by prototype pathogen preparedness. June 11, 2020 (https://www.biorxiv.org/content/10.1101/2020.06.11.145920v1). preprint. PMC7581537 32756549 · DOI
  2. [13]Walsh EE, Frenck R, Falsey AR, et al. RNA-based COVID-19 vaccine BNT162b2 selected for a pivotal efficacy study. August 28, 2020 (https://www.medrxiv.org/content/10.1101/2020.08.17.20176651v2). preprint. · DOI
  3. [16]Corbett KS, Edwards DK, Leist SR, et al. SARS-CoV-2 mRNA vaccine design enabled by prototype pathogen preparedness. Nature 2020 August 5 (Epub ahead of print). 32756549 PMC7581537

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Authors
Anderson, E. J., Rouphael, N. G., Widge, A. T., Jackson, L. A., Roberts, P. C., Makhene, M., Chappell, J. D., Denison, M. R., Stevens, L. J., Pruijssers, A. J., McDermott, A. B., Flach, B., Lin, B. C., Doria-Rose, N. A., O’Dell, S., Schmidt, S. D., Corbett, K. S., Swanson, P. A., Padilla, M., Neuzil, K. M., Bennett, H., Leav, B., Makowski, M., Albert, J., Cross, K., Edara, V. V., Floyd, K., Suthar, M. S., Martinez, D. R., Baric, R., Buchanan, W., Luke, C. J., Phadke, V. K., Rostad, C. A., Ledgerwood, J. E., Graham, B. S., & Beigel, J. H.
Affiliations
  • Emory University (US)
  • Kaiser Permanente Washington Health Research Institute (US)
  • From the Center for Childhood Infections and Vaccines of Children’s Healthcare of Atlanta and the Department of Pediatrics, Emory University School of Medicine (E.J.A., V.V.E., K.F., M.S.S., C.A.R.), and Emory Vaccine Center, Yerkes National Primate Research Center, Emory University (M.S.S.), Atlanta, and Hope Clinic, Department of Medicine, Emory University School of Medicine, Decatur (E.J.A., N.G.R., V.K.P.) — both in Georgia; the Vaccine Research Center (A.T.W., A.B.M., B.F., B.C.L., N.A.D.-R., S...
  • National Institutes of Health (US)
  • University of North Carolina at Chapel Hill (US)
Corresponding author
Anderson, Evan J.
Venue
New England Journal of Medicine
Published
2020-12-17
Volume
383
Issue
25
Pages
2427-2438
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W3090717270
Cited by
1,523
References
24
Citations by year
2026: 40 · 2025: 94 · 2024: 111 · 2023: 191 · 2022: 381 · 2021: 630 · 2020: 71 · 2012: 1
FWCI
41.76
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
National Institute of Allergy and Infectious Diseases (AI149644, HHSN272201500002C, P51 OD011132, UM1AI148373, UM1AI148576, UM1AI148684, UM1Al148684-01S1)
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 › Immunology and Microbiology › Immunology › Immune responses and vaccinations
Keywords
mRNA-1273 vaccine, SARS-CoV-2, COVID-19 vaccines, older adults, vaccine safety, immunogenicity, binding antibodies, neutralizing antibodies, CD4+ T cell responses, dose-dependent immune response, adverse events, vaccine hesitancy
MeSH terms
COVID-19, SARS-CoV-2, COVID-19 Vaccines, 2019-nCoV Vaccine mRNA-1273, Aged, Antibodies, Viral, Dose-Response Relationship, Drug, Female, Humans, Male, Middle Aged, Neutralization Tests, T-Lymphocytes, Antibodies, Neutralizing, Spike Glycoprotein, Coronavirus

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