funded by Lanzhou Institute of Biological Products Company Limited.We would like to thank Prof.Guoyong Yuan from the University of Hong Kong for providing SARS-CoV-2 Omicron virus applied in live-virus neutralization assay。
The increased coronavirus disease 2019(COVID-19)breakthrough cases pose the need of booster vaccination.We conducted a randomised,double-blinded,controlled,phase 2 trial to assess the immunogenicity and safety of the ...