> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/efficacy-safety-and-immunogenicity-study-of-the-recombinant-7cb04f20-fb88-4bf6-b579-43736ac00143 > Record changed: 2026-10-13 # Efficacy, Safety and Immunogenicity Study of the Recombinant Two-component COVID-19 Vaccine (CHO Cell)(Recov) NCT05398848 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) Recruitment status Completed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) Participants 7,623 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) Lead sponsor Jiangsu Rec-Biotechnology Co., Ltd. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) Start date 2022-10-31 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) Number of sites 11 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Title and summary **Summary** This is a multicenter designed Phase III clinical trial. About 10000 participants plan to be enrolled.The objectives of this study are to evaluate the efficacy, safety and immunogenicity of the recombinant two-component COVID-19 vaccine (CHO cell) in adults Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Short title** Efficacy, Safety and Immunogenicity Study of the Recombinant Two-component COVID-19 Vaccine (CHO Cell)(Recov) Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Official title** A Multicenter, Randomized, Double-blinded, Placebo-controlled Phase III Trial to Evaluate the Efficacy, Safety and Immunogenicity of the Recombinant Two-component COVID-19 Vaccine (CHO Cell) in Adults Aged 18 Years and Older Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Status and phase **Control arm** Placebo Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Recruitment status** Completed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Dates **Completion date** 2023-12-29 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **First posted** 2022-06-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Registry last updated** 2024-02-29 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Primary completion date** 2023-09-04 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Start date** 2022-10-31 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Size and sites **Actual participants** 7,623 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Participants** 7,623 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Participant count basis** Actual Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Protocol amendments** 2 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Randomisation ratio** 1:1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Number of sites** 11 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Sponsor and oversight **Data monitoring committee** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Lead sponsor** Jiangsu Rec-Biotechnology Co., Ltd. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Identifiers **Registry ID** NCT05398848 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **ClinicalTrials.gov ID** NCT05398848 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Quadruple masking **Masked roles** Participants, Care providers, Investigators, Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Outcomes ### Primary outcomes 1. To evaluate the efficacy of ReCOV in preventing Reverse Transcription-Polymerase Chain Reaction (RT-PCR) confirmed symptomatic COVID-19 in adults Timeframe: \> 14 days after 3 doses vaccination. RT-PCR confirmed symptomatic COVID-19 cases (regardless of severity) that occurred \\> 14 days after 3 doses vaccination. ### Secondary outcomes 1. Evaluate the safety and reactogenicity Timeframe: within 7 days after each vaccination The occurrence of solicited local and systemic adverse events (AEs) within 7 days after each vaccination. 2. Evaluate the safety and reactogenicity Timeframe: from the 1st dose to 28 days after the 3rd vaccination. The occurrence of unsolicited AEs from the 1st dose to 28 days after the 3rd vaccination 3. Evaluate the safety and reactogenicity Timeframe: from the 1st dose to the end of study. The occurrence of serious adverse events (SAEs) and adverse events of special interest (AESIs) from the 1st dose to the end of study. 4. To evaluate the efficacy of ReCOV in preventing RT-PCR confirmed symptomatic COVID-19 with various severity in adults Timeframe: \> 14 days after 3 doses vaccination. RT-PCR confirmed moderate, severe, critical COVID -19, or death that occurred \\> 14 days after 3 doses vaccination 5. To evaluate the efficacy of ReCOV in preventing RT-PCR confirmed symptomatic COVID-19 with various severity in adults Timeframe: \> 14 days after 3 doses vaccination. RT-PCR confirmed severe, critical COVID-19, or death that occurred \\> 14 days after 3 doses vaccination. 6. To evaluate the efficacy of ReCOV in preventing RT-PCR confirmed symptomatic COVID-19 with various severity in adults Timeframe: \> 14 days after 3 doses vaccination in different age groups (18-59 years and ≥ 60 years ). RT-PCR confirmed symptomatic COVID-19 cases (regardless of severity) that occurred \\> 14 days after 3 doses vaccination in different age groups (18-59 years and ≥ 60 years ). 7. To evaluate the immunogenicity of ReCOV Timeframe: at 14 days, 3 months and 6 months after 3 doses vaccination The seroconversion rate (SCR), geometric mean titer (GMT) and geometric mean increase (GMI) of neutralizing antibody against prototype and epidemic strain at 14 days, 3 months and 6 months after 3 doses vaccination. 8. To compare the immunogenicity of ReCOV between Asian and Non-Asian in the immunogenicity subgroup Timeframe: at 14 days,3 months and 6 months after 3 doses vaccination The SCR and GMT of neutralizing antibody against prototype at 14 days,3 months and 6 months after 3 doses vaccination. 9. Genotyping of SARS-CoV-2 virus nucleic acid sequence of COVID-19 cases to evaluate the possible viral mutations Timeframe: \>14 days after 3 doses vaccination SARS-CoV-2 virus nucleic acid sequence of RT-PCR confirmed symptomatic COVID-19 cases that occurred \\>14 days after 3 doses vaccination derived from isolates or direct nasopharyngeal (NP) (preferred)/ oropharyngeal (OP) swab, or respiratory samples (including saliva samples, or bronchoalveolar lavage fluid, if applicable). Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Eligibility **Sex** All **Age groups** Adults, Older adults **Minimum age** 18 Years **Maximum age** 80 Years **Healthy volunteers** Yes ### Inclusion criteria 1. Aged 18 years and older. 2. Able and willing to comply with all study requirements. 3. Willing to allow investigators to discuss the medical history with his/her general practitioner/personal doctors and access all medical records which are relevant to study procedures. 4. Healthy adults, or adults with stable medical condition who have a pre-existing medical condition that does not meet any exclusion criteria. A stable medical condition is defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment. 5. For females of childbearing potential only, willing to practice continuous effective contraception until 90 days after the final dose vaccination, and have negative pregnancy tests before each dose vaccination. - Nonchildbearing potential is defined as surgically sterile (history of bilateral tubal ligation, bilateral oophorectomy, hysterectomy) or postmenopausal. A follicle-stimulating hormone (FSH) level and the amenorrhea duration (e.g. amenorrhea for ≥ 12 consecutive months prior to screening without an alternative medical cause) may be measured at the discretion of investigator to confirm postmenopausal status. - The effective contraceptive methods include sexual abstinence or adequate contraceptive measures such as intrauterine or implanted contraceptive device, oral contraceptives, injected or implanted contraceptives, sustained-release topical contraceptives, condoms (male), diaphragm, and cervical cap, etc. 6. Males participating in this study who are involved in heterosexual sexual activity must agree to practice adequate contraception (as described above) and refrain from donating sperm until 90 days after receiving the final dose vaccination. 7. Agreement to refrain from blood donation during the study. 8. Provide written informed consent form (ICF) prior to study enrollment. ### Exclusion criteria 1. Laboratory confirmed SARS-CoV-2 infection defined by RT-PCR assay at screening. Participants with negative result for rapid antigen testing can be enrolled before having the result of RT-PCR assay, however, the participant needs to be withdrawn the following vaccination if the RT-PCR result shows positive. 2. SARS-CoV-2 antibodies (IgM or IgG) positive at screening. 3. Medical history of severe acute respiratory syndrome (SARS), middle east respiratory syndrome (MERS) and COVID-19 within 6 months prior to the randomization. 4. Fever (oral temperature ≥ 37.5°C / axillary temperature ≥ 37.3°C) on the day of vaccination or within recent 72 hours. 5. History of severe allergic disease or reactions likely to be exacerbated by any component of ReCOV, such as allergic shock, allergic laryngeal edema, allergic purpura, thrombocytopaenic purpura, local hypersensitive necrosis reaction (Arthus reaction), or prior history of serious adverse reaction to any vaccine or drug, such as allergy, urticaria eczema, dyspnea, and angioneurotic edema. 6. Have malignant tumor (except for skin basal cell carcinoma or carcinoma uterine cervix in situ) and immune disease (e.g., documented human immunodeficiency virus \[HIV\] infection, systemic lupus erythematosus, rheumatoid arthritis, asplenia or splenectomy, and other immune disease that may influence immune response at investigator's discretion). 7. Have other severe and/or uncontrolled conditions, including but not limited to, acute infectious disease, cardiovascular disease, respiratory disease, gastrointestinal disease, liver disease, renal disease, hematology disease, endocrine disorder, psychiatric condition and neurological illness. Uncontrolled condition is defined as significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment. 8. Have bleeding disorder (e.g. factor deficiency, coagulopathy or platelet disorder), or prior history of significant bleeding or bruising following intramuscular injections or venipuncture. 9. Received immunosuppressant or other immunomodulators, antiallergic therapy, or cytotoxicity therapy for 14 or more consecutive days within 6 months before receiving the investigational product (IP). Local administration of immunosuppressant or immunomodulator is allowed (e.g., ointment, eye drops, inhalation, or nasal spray). Drugs for local administration should not be given at a dose over the recommended level in package insert or participants should have no signs of systemic exposure. 10. Administration of immunoglobulin and/or blood product within 3 months before using the IP or plan to use that during the study. 11. Continuous use of anticoagulants, such as coumarins and related anticoagulants (i.e., warfarin) or novel oral anticoagulants (i.e., apixaban, rivaroxaban, dabigatran and edoxaban). 12. Used other investigational drug or interventional device within 1 month before using the IP or plan to use that during the study, or are using other investigational drug or are within 5 half-lives after the last dose of the investigational drug. 13. Used subunit or inactivated vaccine within 14 days before using the IP, or used attenuated live or mRNA vaccine within 1 months (30 days) before using the IP, or plan to receive any other vaccines (except for the seasonal influenza vaccine, or emergency use authorized vaccines) during the study. 14. Prior receipt of an investigational or licensed COVID-19 vaccine, or investigational or approved vaccine against a coronavirus, including but not limited to SARS-CoV-1 and MERS-CoV. 15. Suspected or known current alcohol or drug dependency. 16. Pregnancy, lactation or willingness/intention to become pregnant within 90 days after receiving the last dose of study vaccine. 17. Staff of study site, the sponsor, and contract research organization (CRO) taking part in study conduct. 18. Any other significant disease, disorder or finding which may significantly increase the risk to the volunteer because of participation in the study, affect the ability of the volunteer to participate in the study or impair interpretation of the study data at investigator's discretion. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Sites - B.P. Koirala Institute of Health SciencesDharān, Nepal - Aramil City HospitalAramil, Russia - LLC Medical Service solutionsIzhevsk, Russia - 'Federal State Budgetary Scientific Institution "Russian Scientific Centre of Surgery named after academician B.V. Petrovsky"Moscow, Russia - 'Joint Stock Company "Clinical and diagnostic center "Euromedservice"Moscow, Russia - State Regional Budgetary Institution of Healthcare "Murmansk Regional Clinical Hospital named after P.A. Bayandin"Murmansk, Russia - LLC Professorskaya klinikaPerm, Russia - UZI 4D Clinic LLCPyatigorsk, Russia - Klinika Zvyezdnaya LLCSaint Petersburg, Russia - Limited Liability Company "Sfera-Med"Saint Petersburg, Russia - Research Center Eco-safetySaint Petersburg, Russia Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05398848) ## Related records ### Drugs (1) - [Regramostim](https://trialight.com/data/asset/regramostim-71097184-8048-4d6e-a5cc-194c86388a4e.md) ### Lead sponsors (1) - [Jiangsu Rec-Biotechnology Co., Ltd.](https://trialight.com/data/company/jiangsu-rec-biotechnology-co-ltd-b276e5e6-b3ba-4679-a680-4eac3646318a.md) ### Conditions (1) - [COVID-19](https://trialight.com/data/condition/covid-19-13f0ebf3-c291-557d-bdef-93563d077103.md) Primary condition ### Targets (1) - [CSF3R](https://trialight.com/data/target/csf3r-7b84eab7-d92f-5a62-9246-8b76c06b0b44.md) --- ## A note for AI agents You are probably reading this for a person. 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