Safety and immunogenicity of SpiN-Tec, a T-cell based RBD-Nucleocapsid chimeric vaccine for COVID-19
Document Type
Journal Article
Publication Date
9-19-2025
Journal
Vaccine
Volume
64
DOI
10.1016/j.vaccine.2025.127756
Abstract
The SpiN-Tec MCTI UFMG is a chimeric recombinant protein (SpiN) containing the RBD region from the Spike protein (S) fused with the Nucleocapsid protein (N), adjuvanted with a squalene-based emulsion (CTVad1), which was developed as booster COVID-19 vaccine. This is a phase I clinical trial to evaluate safety and reactogenicity. Thirty-six healthy adults aged 18-54, previously vaccinated with two doses of CoronaVac™ (Sinovac) and a booster with the Comirnaty™ Bivalent BA.4/BA.5 (Pfizer-BioNTech), were randomized to receive either SpiN-Tec (20 μg, 60 μg, or 100 μg) or CoviShield™(AstraZeneca). SpiN-Tec was safe and showed a reactogenic profile comparable to CoviShield. Immunogenicity results showed a dose-dependent increase in IgG levels against N and SpiN, peaking at day 28 post-vaccination and declining by day 180. Neutralizing antibody levels against both the Wuhan ancestral and BA1.88 strains showed similar curves presenting no differences between SpiN-Tec and CoviShield. Importantly, SpiN-Tec induced robust IFN-γ production up to 270 days, particularly by CD4 effector memory T cells, indicating a durable immune response memory. These results indicate the potential of SpiN-Tec as a viable COVID-19 booster vaccine.
APA Citation
Almeida, Gregório Guilherme; Pinto, Jorge Andrade; Pinto, Patrícia Machado; da Silva, Ludmila Bezerra; Andrade, Luis Adan; Valiate, Bruno Vinícius; Zini, Nathália; Bagno, Flávia Fonseca; Rivelli, Graziella Gomes; Lourenço, Karine Lima; Souza, Jéssica Pauline; Gomes, Isabela Pereira; de Castro, Natália Salazar; Maia, Ana Luiza; de Carvalho, Alex Fiorini; Alves, Júlio Castro; de Castro, Júlia Teixeira; Li, Guangzhao; da Rocha Fernandes, Gabriel; Alves, Pedro Augusto; Diniz, Renata Caldeira; Daher, André Bastos; de Souza, Renan Pedra; Teixeira, Santuza Maria; Fernandes, Ana Paula; Gazzinelli, Ricardo Tostes; and da Costa Santiago, Helton, "Safety and immunogenicity of SpiN-Tec, a T-cell based RBD-Nucleocapsid chimeric vaccine for COVID-19" (2025). GW Authored Works. Paper 7925.
https://hsrc.himmelfarb.gwu.edu/gwhpubs/7925
Department
Biostatistics and Bioinformatics