Oral Administration of MVA-Vectored Vaccines Induces Robust, Long-Lasting Neutralizing Antibody Responses and Provides Complete Protection Against SARS-CoV-2 in Mice, Minks, and Cats
文献类型: 外文期刊
作者: Linya Feng; Hong Huo; Yunlei Wang; Lei Shuai; Gongxun Zhong; Zhiyuan Wen; Liyan Peng; Jinying Ge; Jinliang Wang; Chong Wang; Weiye Chen; Xijun He; Xijun Wang; Zhigao Bu
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关键词: COVID-19; SARS-CoV-2; S protein; MVA; vaccine
期刊名称: Vaccines
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年卷期: 2025 年
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收录情况: SCIE(2025版)
摘要: Background/Objectives: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) can naturally infect a broad spectrum of animal species, with cats, minks, and ferrets being highly susceptible. There is a potential risk that infected animals could transmit viruses to humans. Moreover, SARS-CoV-2 continues to evolve via mutation and genetic recombination, resulting in the continuous emergence of new variants that have triggered a wave of reinfection. Therefore, safe and effective corona virus disease 2019 (COVID-19) vaccines for animals are still being sought. Methods: We generated three recombinant Modified vaccinia virus Ankara (MVAs) expressing the prefusion-stabilized S proteins, S6P, DS6P, and BA2S6P, targeting the full-length S protein genes of the ancestral, Delta, and Omicron BA.2 strains of SARS-CoV-2. Subsequently, the safety, immunogenicity, and protective efficacy of these MVA-based oral COVID-19 vaccine candidates were assessed in mice, minks, and cats. Results: These recombinant MVAs are safe in mice, minks, and cats. Oral or intramuscular vaccination with rMVA-S6P induced a robust SARS-CoV-2 neutralizing antibody (NA) response and conferred complete protection against the SARS-CoV-2 challenge in mice. Meanwhile, oral or intramuscular administration of these recombinant MVAs in combination induced a potent and durable NA response against homotypic SARS-CoV-2 pseudovirus in mice, minks, and cats, respectively. Conclusions: These findings suggest that the MVA-vectored vaccines are promising oral COVID-19 vaccine candidates for animals, and that the combined vaccination approach is an effective administration strategy for such vaccines.
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