A Phase III Clinical Study of a SARS-CoV-2 Messenger Ribonucleic Acid (mRNA) Vaccine Candidate Against COVID-19 in Population Aged 18 Years and Above

Summary

Approximately 28,000 subjects will be enrolled in this trial. Eligible subjects will be stratified by age (\<60 years of age and ≥60 years of age, the proportion of elderly people ≥60 years old is planned to be ≥25%) and randomly assigned into the study group and the control group at a ratio of 1:1 (14,000 in each group) to be intramuscularly administered with the investigational vaccine or placebo in a 2-dose regimen at an interval of 28 days. The experimental vaccines will be cross-vaccinated after available data of the investigational vaccine show that expected efficacy and good safety have been achieved (i.e., subjects in the study group will be vaccinated with placebo and those in the control group will be vaccinated with the investigational vaccine in the same schedule as stated above ). After the completion of the second dose for crossover vaccination, subjects will be followed up for 12 months for safety observation. An immunogenicity subgroup (n≥3000) and a reactogenicity subgroup (n≥6000) will also be included in this trial to evaluate the humoral immunity induced by the investigational vaccine and the solicited adverse events observed within 7 days post immunization. All enrolled subjects will be followed up for the evaluation of protective efficacy as well, which will be primarily characterized by the incidence rate (person-year) of COVID-19 cases collected from 14 days after complete series. Adverse events will be collected over 0-28 days after each vaccination and serious adverse events will be collected from Dose 1 through 12 months post complete series.

Timeline

Start

2021-07-22

Primary completion

2021-11-30

Completion

2023-05-30

Publications

• Liu X, Li Y, Wang Z, Cao S, Huang W, Yuan L, Huang YJ, Zheng Y, Chen J, Ying B, Xiang Z, Shi J, Zhao J, Huang Z, Qin CF. Safety and superior immunogenicity of heterologous boosting with an RBD-based SARS-CoV-2 mRNA vaccine in Chinese adults. Cell Res. 2022 Aug;32(8):777-780. doi: 10.1038/s41422-022-00681-3. Epub 2022 Jun 14. No abstract available.
• Zhang NN, Zhang RR, Zhang YF, Ji K, Xiong XC, Qin QS, Gao P, Lu XS, Zhou HY, Song HF, Ying B, Qin CF. Rapid development of an updated mRNA vaccine against the SARS-CoV-2 Omicron variant. Cell Res. 2022 Apr;32(4):401-403. doi: 10.1038/s41422-022-00626-w. Epub 2022 Feb 14. No abstract available.

Drugs

Indications