> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/a-phase-iii-clinical-trial-of-recombinant-covid-19-trivalent-f538536b-a80b-4b5a-9f46-96e75b03834a > Record changed: 2026-10-13 # A Phase Ⅲ Clinical Trial of Recombinant COVID-19 Trivalent (XBB+BA.5+Delta) Protein Vaccine (Sf9 Cell) in Booster Vaccination NCT05911061 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) Recruitment status Unknown Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) Participants 4,950 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) Lead sponsor WestVac Biopharma Co., Ltd. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) Start date 2024-12-30 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Title and summary **Summary** A Phase Ⅲ Clinical Trial of Recombinant COVID-19 Trivalent (XBB+BA.5+Delta) Protein Vaccine (Sf9 Cell) in Booster Vaccination to Evaluate Efficacy, Safety and Immunogenicity Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Short title** A Phase Ⅲ Clinical Trial of Recombinant COVID-19 Trivalent (XBB+BA.5+Delta) Protein Vaccine (Sf9 Cell) in Booster Vaccination Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Official title** A Multicenter, Randomized, Double-Blind, Controlled, Phase Ⅲ Clinical Trial of Recombinant COVID-19 Trivalent (XBB+BA.5+Delta) Protein Vaccine (Sf9 Cell) in Booster Vaccination to Evaluate Efficacy, Safety and Immunogenicity in Population Aged 18 Years Old and Above Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Status and phase **Control arm** Placebo Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Recruitment status** Unknown Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Dates **Completion date** 2025-12-30 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **First posted** 2023-06-20 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Registry last updated** 2024-07-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Primary completion date** 2025-06-30 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Start date** 2024-12-30 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Size and sites **Participants** 4,950 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Participant count basis** Estimated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Planned participants** 4,950 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Protocol amendments** 0 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Sponsor and oversight **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Lead sponsor** WestVac Biopharma Co., Ltd. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Identifiers **Registry ID** NCT05911061 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **ClinicalTrials.gov ID** NCT05911061 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Double masking **Masked roles** Participants, Investigators Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Outcomes ### Primary outcomes 1. Efficacy against COVID-19 Timeframe: 14 days after vaccination Efficacy against the first occurrence of a virologically confirmed (PCR-positive) case of symptomatic COVID-19, regardless of severity, 14 days after booster vaccination. 2. AE and AR Timeframe: 0-7 days after vaccination Incidence of adverse events (AE) and adverse reactions (AR) 0-7 days after booster vaccination. ### Secondary outcomes 1. Secondary Efficacy against COVID-19 Timeframe: \>7 days after booster vaccination Efficacy against the first occurrence of a virologically confirmed (PCR-positive) case of symptomatic COVID-19 \\> 7 days after booster vaccination in subjects, regardless of severity. 2. Secondary Efficacy against COVID-19 Timeframe: \> 7 days and > 14 days after booster vaccination Efficacy against first occurrence of virologically confirmed (PCR-positive) cases of moderate/severe COVID-19 caused by SARS-CoV-2 infection, cases of hospitalization due to COVID-19, and cases of death due to COVID-19, \\> 7 days and \\> 14 days after booster vaccination 3. Secondary Safety Timeframe: 0-30 days after booster vaccination Incidence of adverse events (AE) and adverse reactions (AR) 0-30 days after booster vaccination. 4. Secondary Safety Timeframe: within 12 months after booster vaccination Incidence of serious adverse events (SAE) and adverse events of special interest (AESI) within 12 months after booster vaccination. 5. Secondary Immunogenicity indicator 1 Timeframe: day 14, day 30 and 3 months after booster vaccination The geometric mean titer (GMT), seroconversion rate and geometric mean fold increase (GMI) of neutralizing antibodies against SARS-CoV-2 variants (based on the current variants at same time) on day 14, day 30 and 3 months after booster vaccination. 6. Secondary Immunogenicity indicator 2 Timeframe: day 14, day 30 and 3 months after booster vaccination Geometric mean titer (GMT), seroconversion rate and geometric mean fold increase (GMI) of anti-SARS-CoV-2 specific binding antibodies were measured on day 14, day 30 and 3 months after booster vaccination. Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Eligibility **Sex** All **Age groups** Adults, Older adults **Minimum age** 18 Years **Healthy volunteers** Yes ### Inclusion criteria 1. Subjects aged 18 years and above, including those with underlying diseases and immunocompromised subjects. 2. Basic or booster immunization with COVID-19 vaccine ≥6 months. 3. ≥3 months of SARS-CoV-2 infection history, or never infected. 4. Have the ability to understand research procedures, with informed consent, voluntarily sign informed consent, and be able to comply with the requirements of clinical research protocols. ### Exclusion criteria 1. Axillary temperature ≥37.3℃. 2. SARS-CoV-2 antigen or nucleic acid screening positive within the last 48 hours. 3. Anti-SARS-CoV-2 IgM antibody was positive during the screening period. 4. It is in the advanced stage of malignant tumor and the disease control is unstable. 5. Female pregnancy (pregnancy test results are positive), lactation period. 6. Have serious cardiovascular diseases, such as arrhythmia, conduction block, myocardial infarction, heart failure, severe hypertension, and can not be controlled by drugs. 7. Have other serious chronic conditions such as uncontrolled asthma, diabetes, chronic obstructive pulmonary disease, pulmonary embolism, chronic kidney disease requiring dialysis, cirrhosis of the liver, convulsions, epilepsy and other neurological/psychiatric conditions. 8. Have been diagnosed with congenital or acquired immunodeficiency, HIV infection. 9. People who are allergic to any component of the investigational vaccine have a history of more severe allergies or allergic reactions to the vaccine in the past. 10. Congenital or acquired angioedema/neuroedema. 11. Asplenia or functional asplenia. 12. Thrombocytopenia or other clotting disorders (which may cause intramuscular injection contraindications). 13. Received another investigational drug within 1 month prior to receiving the investigational vaccine. 14. Received subunit or inactivated vaccine within 14 days prior to receiving the investigational vaccine, or received live attenuated vaccine within 1 month. 15. Fertile female subjects did not use effective contraception within 1 month prior to enrollment. 16. Fertile female and male subjects have pregnancy plans and sperm/egg donation plans from the screening period to 3 months after immunization. 17. Abnormal laboratory test results during the screening period, which were judged by the researcher to be unsuitable for the study vaccine. 18. Medical, psychological, social, or other conditions that, in the investigator's judgment, are inconsistent with the protocol or affect the subject's signing of informed consent. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05911061) ## Related records ### Drugs (3) - [Nepafenac](https://trialight.com/data/asset/nepafenac-96b6dc32-9431-4662-97dd-bbaf8ea3d7a7.md) - [Prednisolone](https://trialight.com/data/asset/prednisolone-783fce19-b285-4835-90c3-3db5a6364414.md) - [Ribavirin](https://trialight.com/data/asset/ribavirin-94510534-209a-4906-917e-ae8c153df440.md) ### Lead sponsors (1) - [WestVac Biopharma Co., Ltd.](https://trialight.com/data/company/westvac-biopharma-co-ltd-fa57a7f3-9053-4f67-8ea4-042d6bc1a577.md) ### Conditions (1) - [COVID-19](https://trialight.com/data/condition/covid-19-13f0ebf3-c291-557d-bdef-93563d077103.md) Primary condition ### Targets (4) - [IMPDH1](https://trialight.com/data/target/impdh1-f707e053-7546-53bb-906d-11537a2df3e7.md) - [NR3C1](https://trialight.com/data/target/nr3c1-98974b8d-fb89-5483-955e-d4a994c71532.md) - [PTGS1](https://trialight.com/data/target/ptgs1-5707ce48-8ccd-5bd5-8c18-9c64cacc2fef.md) - [PTGS2](https://trialight.com/data/target/ptgs2-85dbd9a5-4609-5423-b863-90d0a825b213.md) --- ## A note for AI agents You are probably reading this for a person. 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