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Hu W, Liu X, Lu X, Zhang D, Liu S, Gu X, Liu D, Sun J, Zhou T, Li X, Gao Y, Zhao Y, Cui G, Zhang S. Immunogenicity, safety and consistency of seven lots of an inactivated COVID-19 vaccine in healthy children and adolescents: a randomized, double-blind, controlled, phase IV clinical trial. Front Immunol 2024; 14:1320352. [PMID: 38250072 PMCID: PMC10796506 DOI: 10.3389/fimmu.2023.1320352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/12/2023] [Indexed: 01/23/2024] Open
Abstract
Background CoronaVac has been authorized worldwide for preventing coronavirus disease 2019. Information on the safety, immunogenicity and consistency of different lots and workshops of CoronaVac is presented here. Methods In this randomized, double-blind, phase IV clinical trial in healthy children and adolescents aged 3-17 years, we aimed to assess the lot-to-lot and workshop-to-workshop consistency, as well as immunogenicity and safety of seven lots of commercial-scale CoronaVac from three workshops. Eligible participants were enrolled into three age cohorts (3-5, 6-11 and 12-17 years). Within each cohort, participants were randomly assigned to seven groups to receive two doses of CoronaVac, with four weeks apart. Serum samples were collected before the first dose and 28 days after the second dose for neutralizing antibody testing. The primary objective was to evaluate the consistency of immune response among different lots within workshop 2 or 3, as well as among different workshops. The primary endpoint was geometric mean titer (GMT) of neutralizing antibody at 28 days after full-course vaccination. Results Between July 27th and November 19th, 2021, a total of 2,520 eligible participants were enrolled. Results showed that 95% confidence intervals (CIs) of GMT ratios for all comparative groups among different lots or workshops were within the equivalence criteria of [0.67, 1.5]. The GMT and seroconversion rate for all participants were 126.42 (95%CI: 121.82, 131.19) and 99.86% (95%CI: 99.59%, 99.97%) at 28 days after two-dose vaccination. The incidences of adverse reactions were similar among seven lots, and most adverse reactions were mild in Grade 1, with no serious adverse event. Conclusion CoronaVac is well-tolerated and can elicit a good immune response among children and adolescents. Lot-to-lot consistency results indicate stable manufacturing of commercial-scale CoronaVac.
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Affiliation(s)
- Weijun Hu
- Institute of Immunization Program, Shaanxi Provincial Center for Disease Control and Prevention, Xi’an, China
| | - Xiaoyu Liu
- Institute of Immunization Program, Shaanxi Provincial Center for Disease Control and Prevention, Xi’an, China
| | - Xi Lu
- Medical Affairs Department, Sinovac Biotech Co., Ltd., Beijing, China
| | - Dan Zhang
- Institute of Immunization Program, Shaanxi Provincial Center for Disease Control and Prevention, Xi’an, China
| | - Shuo Liu
- Clinical Research and Development Center, Sinovac Biotech Co., Ltd., Beijing, China
| | - Xianjin Gu
- Department of Immunization Program, Yanliang District Center for Disease Control and Prevention, Xi’an, China
| | - Dan Liu
- Department of Immunization Program, Yanliang District Center for Disease Control and Prevention, Xi’an, China
| | - Jianwen Sun
- Medical Affairs Department, Sinovac Life Sciences Co., Ltd., Beijing, China
| | - Tiantian Zhou
- Institute of Immunization Program, Shaanxi Provincial Center for Disease Control and Prevention, Xi’an, China
| | - Xinge Li
- Clinical Research and Development Center, Sinovac Biotech Co., Ltd., Beijing, China
| | - Yongjun Gao
- Medical Affairs Department, Sinovac Biotech Co., Ltd., Beijing, China
| | - Yanwei Zhao
- Medical Affairs Department, Sinovac Life Sciences Co., Ltd., Beijing, China
| | - Guoliang Cui
- Quality Assurance Department, Sinovac Life Sciences Co., Ltd., Beijing, China
| | - Shaobai Zhang
- Institute of Immunization Program, Shaanxi Provincial Center for Disease Control and Prevention, Xi’an, China
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