Nature Communications (Aug 2024)

A single-dose intranasal live-attenuated codon deoptimized vaccine provides broad protection against SARS-CoV-2 and its variants

  • Xiang Liu,
  • Wern Hann Ng,
  • Eva Zusinaite,
  • Joseph Freitas,
  • Adam Taylor,
  • Venugopal Yerragunta,
  • Shukra Madhaha Aavula,
  • Sambaiah Gorriparthi,
  • Santhakumar Ponsekaran,
  • Rama Lakshmi Bonda,
  • Priyanka Mani,
  • Sridevi V. Nimmagadda,
  • Sainan Wang,
  • Laura Sandra Lello,
  • Ali Zaid,
  • Ujjwal Dua,
  • Sharon A. Taft-Benz,
  • Elizabeth Anderson,
  • Victoria K. Baxter,
  • Sanjay Sarkar,
  • Zheng L. Ling,
  • Thomas M. Ashhurst,
  • Samuel M. S. Cheng,
  • Priyabrata Pattnaik,
  • Anand Kumar Kanakasapapathy,
  • Ralph S. Baric,
  • Felicity J. Burt,
  • Malik Peiris,
  • Mark T. Heise,
  • Nicholas J. C. King,
  • Andres Merits,
  • Rajendra Lingala,
  • Suresh Mahalingam

DOI
https://doi.org/10.1038/s41467-024-51535-y
Journal volume & issue
Vol. 15, no. 1
pp. 1 – 19

Abstract

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Abstract Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, COVID-19) continues its significant health and economic impact globally. Despite the success of spike-protein vaccines in preventing severe disease, long-lasting protection against emerging variants and the prevention of breakthrough infections and transmission remain elusive. We generate an intranasal live-attenuated SARS-CoV-2 vaccine, CDO-7N-1, using codon deoptimization. CDO-7N-1 shows highly attenuated replication and minimal or no lung pathology in vivo over multiple passages. It induces robust mucosal and systemic neutralizing antibody and T-cell subset responses, in mice (female K18-hACE2 and male HFH4-hACE2 mice), hamsters, and macaques triggered by a single immunization. Mice and hamsters vaccinated with CDO-7N-1 are protected from challenge with wild-type (WT) SARS-CoV-2 and other variants of concern. Serum from vaccinated animals neutralizes WT SARS-CoV-2, variants of concern (beta and delta), variants of interest (omicron XBB.1.5) and SARS-CoV-1. Antibody responses are sustained and enhanced by repeated immunization or infection with WT SARS-CoV-2. Immunity against all SARS-CoV-2 proteins by CDO-7N-1 should improve efficacy against future SARS-CoV-2 variants.