AUTHOR=O’Donnell Kyle L. , Clancy Chad S. , Griffin Amanda J. , Shifflett Kyle , Gourdine Tylisha , Thomas Tina , Long Carrie M. , Furuyama Wakako , Marzi Andrea TITLE=Optimization of Single-Dose VSV-Based COVID-19 Vaccination in Hamsters JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2022 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.788235 DOI=10.3389/fimmu.2021.788235 ISSN=1664-3224 ABSTRACT=

The ongoing COVID-19 pandemic has resulted in global effects on human health, economic stability, and social norms. The emergence of viral variants raises concerns about the efficacy of existing vaccines and highlights the continued need for the development of efficient, fast-acting, and cost-effective vaccines. Here, we demonstrate the immunogenicity and protective efficacy of two vesicular stomatitis virus (VSV)-based vaccines encoding the SARS-CoV-2 spike protein either alone (VSV-SARS2) or in combination with the Ebola virus glycoprotein (VSV-SARS2-EBOV). Intranasally vaccinated hamsters showed an early CD8+ T cell response in the lungs and a greater antigen-specific IgG response, while intramuscularly vaccinated hamsters had an early CD4+ T cell and NK cell response. Intranasal vaccination resulted in protection within 10 days with hamsters not showing clinical signs of pneumonia when challenged with three different SARS-CoV-2 variants. This data demonstrates that VSV-based vaccines are viable single-dose, fast-acting vaccine candidates that are protective from COVID-19.