Omicron BA.4/5-Delta COVID-19 Vaccine Phase I Clinical Trial

The purpose of this study is to evaluate the safety of Omicron BA.4/5-Delta strain recombinant novel coronavirus protein vaccine (CHO cells) after vaccination in people aged 18 and over. It is planned to screen 100 subjects who are 18 years old and above and more than 6 months since the last new coronavirus infection or new coronavirus vaccine. All subjects collected venous blood before vaccination, 14 days, 3 months, and 6 months after vaccination for immunological detection of neutralizing antibody of the new coronavirus prototype strain, Delta strain and Omicron strain (BA.4/5, XBB); All adverse events (AEs) within 30 minutes after vaccination, all AEs (including solicited and non-solicited AEs) on days 0-7, all AEs (non-solicited AEs) on days 8-30, and all AEs within 12 months after vaccination were collected. serious adverse events (SAE) and adverse events of special interest (AESI).