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Intranasal pediatric parainfluenza virus-vectored SARS-CoV-2 vaccine candidate is protective in macaques
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- 09/09/2025
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Cyril Le Nouën, National Institute of Allergy and Infectious Diseases, NIH, BethesdaChrsitine E Nelson, National Institute of Allergy and Infectious Diseases, NIH, BethesdaXueqiao Liu, National Institute of Allergy and Infectious Diseases, NIH, BethesdaHong-Su Park, National Institute of Allergy and Infectious Diseases, NIH, BethesdaYumiko Matsuoka, National Institute of Allergy and Infectious Diseases, NIH, Bethesda
- Language
- English
- Date
- 2022-05-23
- Publisher
- NIH
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- The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. This article is a US Government work. It is not subject to copyright under 17 USC 105.
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- Abstract
- Pediatric SARS-CoV-2 vaccines are needed that elicit immunity directly in the airways, as well as systemically. Building on pediatric parainfluenza virus vaccines in clinical development, we generated a live-attenuated parainfluenza virus-vectored vaccine candidate expressing SARS-CoV-2 prefusion-stabilized spike (S) protein (B/HPIV3/S-6P) and evaluated its immunogenicity and protective efficacy in rhesus macaques. A single intranasal/intratracheal dose of B/HPIV3/S-6P induced strong S-specific airway mucosal IgA and IgG responses. High levels of S-specific antibodies were also induced in serum, which efficiently neutralized SARS-CoV-2 variants of concern. Furthermore, B/HPIV3/S-6P induced robust systemic and pulmonary S-specific CD4+ and CD8+ T-cell responses, including tissue-resident memory cells in lungs. Following challenge, SARS-CoV-2 replication was undetectable in airways and lung tissues of immunized macaques. B/HPIV3/S-6P will be evaluated clinically as pediatric intranasal SARS-CoV-2/parainfluenza virus type 3 vaccine.
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