Cited by 65SARS-CoV-2 and COVID-19 ResearchAnimal Virus Infections StudiesImmune responses and vaccinations

Low-dose Ad26.COV2.S protection against SARS-CoV-2 challenge in rhesus macaques

Open access
He, Xuan, Chandrashekar, Abishek, Zahn, Roland, Wegmann, Frank, Yu, Jingyou, Mercado, Noe B., McMahan, Katherine, Martinot, Amanda J. +25 more·2021·Cell

Published version of a preprint

Abstract

We previously reported that a single immunization with an adenovirus serotype 26 (Ad26)-vector-based vaccine expressing an optimized SARS-CoV-2 spike (Ad26.COV2.S) protected rhesus macaques against SARS-CoV-2 challenge. To evaluate reduced doses of Ad26.COV2.S, 30 rhesus macaques were immunized once with 1 × 10 11, 5 × 10 10, 1.125 × 10 10, or 2 × 10 9 viral particles (vp) Ad26.COV2.S or sham and were challenged with SARS-CoV-2. Vaccine doses as low as 2 × 10 9 vp provided robust protection in bronchoalveolar lavage, whereas doses of 1.125 × 10 10 vp were required for protection in nasal swabs. Activated memory B cells and binding or neutralizing antibody titers following vaccination correlated with protective efficacy. At suboptimal vaccine doses, viral breakthrough was observed but did not show enhancement of disease. These data demonstrate that a single immunization with relatively low dose of Ad26.COV2.S effectively protected against SARS-CoV-2 challenge in rhesus macaques, although a higher vaccine dose may be required for protection in the upper respiratory tract.

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Crossref · 10.1016/j.cell.2021.05.040

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  • Sham-treated animals had higher cumulative lung pathology scores than CVnCoV animals (P = 0.0368) and CV2CoV animals (P = 0.0022).

    “Viral replication was largely resolved by day 10 in the animals vaccinated with CVnCoV and CV2CoV, and those with sham treatment had higher cumulative lung pathology scores19 (CVnCoV animals compared with sham controls, P = 0.0368; CV2CoV animals compared with sham controls, P = 0.0022) (Extended Data Fig. 7a).”
  • Neutralizing antibody titres elicited by CV2CoV to viral variants exceeded the values previously reported as threshold titres for protection (50-100).

    “Although our challenge virus in this study was SARS-CoV-2 WA1/2020, the neutralizing antibody titres elicited by CV2CoV to viral variants exceeded the values we previously reported as threshold titres for protection (50–100)17,19,22.”

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Authors
He, X., Chandrashekar, A., Zahn, R., Wegmann, F., Yu, J., Mercado, N. B., McMahan, K., Martinot, A. J., Piedra-Mora, C., Beecy, S., Ducat, S., Chamanza, R., Huber, S. R., van Heerden, M., van der Fits, L., Borducchi, E. N., Lifton, M., Liu, J., Nampanya, F., Patel, S., Peter, L., Tostanoski, L. H., Pessaint, L., Van Ry, A., Finneyfrock, B., Velasco, J., Teow, E., Brown, R., Cook, A., Andersen, H., Lewis, M. G., Schuitemaker, H., & Barouch, D. H.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • Janssen (Netherlands) (NL)
  • Tufts University (US)
  • Bioqual (US)
Corresponding author
Barouch, Dan H.
Venue
Cell
Publisher
Elsevier BV
Published
2021-06
Volume
184
Issue
13
Pages
3467-3473.e11
ISSN
0092-8674 (ISSN-L)
OpenAlex
W3172273960
Cited by
65
References
18
Citations by year
2026: 9 · 2025: 5 · 2024: 5 · 2023: 12 · 2022: 20 · 2021: 14
FWCI
4.04
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
  • ImmPort
Funders
  • BARDA
  • National Cancer Institute
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
  • Life Sciences › Immunology and Microbiology › Immunology › Immune responses and vaccinations
Keywords
Ad26.COV2-S, SARS-CoV-2, COVID-19 vaccines, low-dose vaccination, rhesus monkeys, vaccine dose optimization, spike protein, viral breakthrough, neutralizing antibodies, memory B cells, single-dose vaccination

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