Article
作者: Zhang, Rong ; Lu, Xuancheng ; Xu, Ke ; Wang, Xi ; Bi, Yuhai ; Liao, Pu ; Han, Pu ; Zhang, Cheng ; Gao, George F. ; Huan, Yu ; Wu, Guizhen ; Li, Xiaoyan ; Xie, Yufeng ; Liu, Sheng ; Hao, Tianjiao ; Lei, Wenwen ; Liu, Peipei ; Xu, Kun ; Li, Ying ; Zhu, Baoli ; Li, Yulei ; Lu, Yafei ; Zhao, Xin ; Jin, Xiyue ; Song, Hao
Highly contagious respiratory illnesses like influenza and COVID-19 pose serious risks to public health. A two-in-one vaccine would be ideal to avoid multiple vaccinations for these diseases. Here, we generated a chimeric receptor binding domain of the spike protein (S-RBD) and hemagglutinin (HA)-stalk-based vaccine for both SARS-CoV-2 and influenza viruses. The S-RBD from SARS-CoV-2 Delta was fused to the headless HA from H1N1 (H1Delta), creating a chimera that forms trimers in solution. The cryo-electron microscopy structure of the chimeric protein complexed with the RBD-targeting CB6 and the HA-stalk-targeting CR9114 antibodies shows that the trimeric protein is stable and accessible for neutralizing antibody binding. Immunization with the vaccine elicited high and long-lasting neutralizing antibodies and effectively protected mice against the challenges of lethal H1N1 or heterosubtypic H5N8, as well as the SARS-CoV-2 Delta or Omicron BA.2 variants. Overall, this study offers a two-in-one universal vaccine design to combat infections caused by both SARS-CoV-2 variants of concern and influenza viruses.