Monovalent vaccination with inactivated SARS-CoV-2 BA.5 protects hamsters against Omicron but not non-Omicron variants. 2023

Chon Phin Ong, and Kaiming Tang, and Pak-Hin Hinson Cheung, and Hongzhuo Zhang, and Tze-Tung Tang, and Yaqian Xue, and Junjue Wang, and Kelvin Kai-Wang To, and Shuofeng Yuan, and Zi-Wei Ye, and Dong-Yan Jin
School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China.

We compared the protective effects of inactivated SARS-CoV-2 vaccines derived from the ancestral and the currently circulating BA.5.2 strains against infection with multiple variants in Syrian golden hamsters. Vaccination with BA.5.2 effectively protected against infection with the Omicron subvariants including XBB.1, but not the Alpha or Delta variant. In contrast, hamsters vaccinated with the ancestral strain demonstrated decent neutralization activity against both the Omicron and non-Omicron variants. Our findings might instruct future design and formulation of SARS-CoV-2 vaccines.

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