Versatile live-attenuated SARS-CoV-2 vaccine platform applicable to variants induces protective immunity.

ABSTRACT: Live-attenuated vaccines are generally highly effective. Here, we aimed to develop one against SARS-CoV-2, based on the identification of three types of temperature-sensitive (TS) strains with mutations in nonstructural proteins (nsp), impaired proliferation at 37°C-39°C, and the capacity to induce protective immunity in Syrian hamsters. To develop a live-attenuated vaccine, we generated a virus that combined all these TS-associated mutations (rTS-all), which showed a robust TS phenotype in vitro and high attenuation in vivo. The vaccine induced an effective cross-reactive immune response and protected hamsters against homologous or heterologous viral challenges. Importantly, rTS-all rarely reverted to the wild-type phenotype. By combining these mutations with an Omicron spik

SUBMITTER: Yoshida A 

PROVIDER: S-EPMC9614708 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature