Study on Sequential Immunization of Inactivated SARS-CoV-2 Vaccine and Recombinant SARS-CoV-2 Vaccine (Ad5 Vector)

Safety and Immunogenicity of Sequential Immunization of Inactivated SARS-CoV-2 Vaccine and Recombinant SARS-CoV-2 Vaccine (Ad5 Vector) in Chinese Healthy Adults Aged 18-59 Years: a Randomized, Observer-blind, Parallel-controlled Clinical Trial

This is a randomized, observer-blind, parallel-controlled study, for evaluation of safety and immunogenicity of sequential immunization of a recombinant SARS-CoV-2 vaccine (adenovirus type 5 vector) in Chinese healthy adults aged 18-59 years after the priming vaccination of inactivated vaccine. 300 healthy subjects aged 18-59 years will be recruited in this study. Of them, 200 subjects who have been vaccinated with two dose of inactive SARS-CoV-2 vaccine will be recruited and randomized at a 1:1 ratio to receive a booster dose of inactivated SARS-CoV-2 vaccine or recombinant SARS-CoV-2 Ad5 vectored vaccine at 3~6 months later. Other 100 subjects who have been vaccinated with one dose of inactivated SARS-CoV-2 vaccine will be recruited and randomized at a 1:1 ratio to receive a booster dose of inactivated SARS-CoV-2 vaccine or recombinant SARS-CoV-2 Ad5 vectored vaccine at 1~3 months later. The occurrence of adverse events within 28 days and serious adverse events within 6 months after vaccination will be observed. In addition, blood samples will be collected on day 0 before the boosting with ad5 vectored vaccine and on day 14, 28 and month 6 after the boosting. Serum antibody levels, cellular immune responses and the subgroups or germlines of the specific B cells will be analyzed. Each subject will remain in this study for approximately 6 months.

Study Overview

• Status: Completed
• Conditions: COVID-19
• Intervention / Treatment: Biological: Recombinant SARS-CoV-2 Ad5 vectored vaccine; Biological: Inactive SARS-CoV-2 vaccine (Vero cell)

• Study Type: Interventional
• Enrollment (Actual): 300
• Phase: Phase 4

Contacts and Locations

Study Locations

• China
  • Jiangsu
    • Nanjing, Jiangsu, China, 210009
      • Jiangsu Provincial Center for Disease Control and Prevention

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 59 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Health subjects aged 18-59 years, who have been completed two-dose regimen of inactive SARS-CoV-2 vaccine in the past 3-6 months, or received one dose of inactive SARS-CoV-2 vaccine in the past 1-3 months.
• The subject can provide with informed consent and sign informed consent form (ICF).
• The subjects are able to and willing to comply with the requirements of the clinical trial program and could complete the 6-month follow-up of the study.
• Axillary temperature ≤ 37.0℃.
• Individuals who are in good health condition at the time of entry into the trial as determined by medical history, physical examination and clinical judgment of the investigator and meet the requirements of immunization.

Exclusion Criteria:

• have the medical history or family history of convulsion, epilepsy, encephalopathy and psychosis.
• be allergic to any component of the research vaccines, or used to have a history of hypersensitivity or serious reactions to vaccination.
• women with positive urine pregnancy test, pregnant or breast-feeding, or have a pregnancy plan within six months.
• have acute febrile diseases and infectious diseases.
• have severe chronic diseases or condition in progress cannot be controlled.
• congenital or acquired angioedema / neuroedema
• have the history of urticaria 1 year before receiving the investigational vaccine.
• have asplenia or functional asplenia.
• have thrombocytopenia or other coagulation disorders (which may cause contraindications for intramuscular injection).
• have needle sickness.
• have the history of immunosuppressive therapy, anti-allergy therapy, cytotoxic therapy or inhaled corticosteroids (excluding corticosteroid spray therapy for allergic rhinitis, and acute corticosteroid therapy without dermatitis) over the past 6 months.
• have received blood products within 4 months before injection of investigational vaccines.
• under anti-tuberculosis treatment.
• not be able to follow the protocol, or not be able to understand the informed consent according to the researcher's judgment, due to various medical, psychological, social or other conditions.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

4

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: heterologous boost arm with Ad5 vectored vaccine; Subjects who have been primed with two doses of inactive SARS-CoV-2 vaccine will receive a booster of recombinant SARS-CoV-2 Ad5 vectored vaccine after 3~6 months.	Biological: Recombinant SARS-CoV-2 Ad5 vectored vaccine; This vaccine contains 5×10^10 virus particles of recombinant replication defective human type 5 adenovirus expressing SARS-CoV-2 S protein, which is produced by CanSino Biologics Inc. It is a liquid dosage form, 0.5 ml / bottle.; Other Names: Ad5-nCoV
Active Comparator: homogeneous boost arm with inactive vaccine; Subjects who have been primed with two doses of inactive SARS-CoV-2 vaccine will receive a booster dose of inactive SARS-CoV-2 vaccine after 3~6 months.	Biological: Inactive SARS-CoV-2 vaccine (Vero cell); This vaccine contains 600 SU of SARS-CoV-2 antigen, which is produced by Sinovac Research & Development Co., Ltd. 0.5 ml / bottle.; Other Names: CoronaVac
Active Comparator: homogeneous regimen arm with inactive vaccine; Subjects who have been primed with one dose of inactive SARS-CoV-2 vaccine will receive one dose of inactive SARS-CoV-2 vaccine after 1~3 months.	Biological: Inactive SARS-CoV-2 vaccine (Vero cell); This vaccine contains 600 SU of SARS-CoV-2 antigen, which is produced by Sinovac Research & Development Co., Ltd. 0.5 ml / bottle.; Other Names: CoronaVac
Experimental: heterologous regimen with Ad5 vectored vaccine; Subjects who have been primed with one dose of inactive SARS-CoV-2 vaccine will receive one dose of recombinant SARS-CoV-2 Ad5 vectored vaccine after 1~3 months.	Biological: Recombinant SARS-CoV-2 Ad5 vectored vaccine; This vaccine contains 5×10^10 virus particles of recombinant replication defective human type 5 adenovirus expressing SARS-CoV-2 S protein, which is produced by CanSino Biologics Inc. It is a liquid dosage form, 0.5 ml / bottle.; Other Names: Ad5-nCoV

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of adverse reactions within 28 days after the booster dose.	Incidence of adverse reactions within 28 days after vaccination.	Within 28 days after the booster dose
GMT of neutralizing antibodies against live SARS-CoV-2 virus on day 14 after the booster dose.	GMT of neutralizing antibodies against live SARS-CoV-2 virus on day 14 after the vaccination.	On day 14 after the booster dose

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of solicited AE within 14 days after the booster dose	Incidence of solicited adverse events (AE) within 14 days after the booster vaccination.	within 14 days after the booster dose
Incidence of unsolicited AE within 28 days after the booster dose.	Incidence of unsolicited adverse events (AE) within 28 days after vaccination.	within 28 days after the booster dose
Incidence of serious adverse events (SAE) till the 6 months after the booster dose.	Incidence of serious adverse events (SAE) till the 6 months after booster vaccination.	within 6 months after the booster dose
GMT of neutralizing antibodies against live SARS-CoV-2 virus on day 28 and month 6 after the booster dose.	GMT of neutralizing antibodies against live SARS-CoV-2 virus on day 28 and month 6 after the booster dose.	on day 28 and month 6 after the last dose of vaccination
Fold increase of binding antibodies against SARS-CoV-2 S and N protein on day 14, day 28 and month 6 after the booster vaccination.	Fold increase of binding antibodies against SARS-CoV-2 S and N protein measured by ELISA, as compared to baseline, on day 14, day 28 and month 6 after the booster vaccination.	on day 14, day 28 and month 6 after the booster vaccination
Fold increase of neutralizing antibodies against live SARS-CoV-2 virus on day 14, day 28 and month 6 after the booster vaccination.	Fold increase of neutralizing antibodies against live SARS-CoV-2 virus, as compared to baseline, on day 14, day 28 and month 6 after the booster vaccination.	on day 14, day 28 and month 6 after the last dose of vaccination
Proportion of the participants with at least a four-fold increase of the binding antibodies against SARS-CoV-2 S and N protein on day 14, day 28 and month 6 after the booster vaccination.	Proportion of the participants with at least a four-fold increase of the binding antibodies against SARS-CoV-2 S and N protein on day 14, day 28 and month 6 after the booster vaccination.	on day 14, day 28 and month 6 after the booster vaccination
Specific T cell responses on day 14 after the booster vaccination.	Specific T cell responses on day 14 after the booster vaccination detected by ELISPOT.	on day 14 after the booster vaccination
GMT of binding antibodies against SARS-CoV-2 S and N protein on day 14, day 28 and month 6 after the booster dose.	GMT of binding antibodies against SARS-CoV-2 S and N protein measured by ELISA on day 14, day 28 and month 6 after the booster vaccination.	on day 14, day 28 and month 6 after the booster vaccination
Proportion of the participants with at least a four-fold increase of neutralizing antibodies against live SARS-CoV-2 virus on day 14, day 28 and month 6 after the booster vaccination.	Proportion of the participants with at least a four-fold increase of neutralizing antibodies against live SARS-CoV-2 virus, as compared to baseline, at Day 14, Day 28 and Month 6 after the booster vaccination.	on day 14, day 28 and month 6 after the booster vaccination

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Types of IgG binding to SARS-CoV-2 S protein on day 14, day 28 and month 6 after the booster vaccination.	Types of IgG binding to SARS-CoV-2 S protein on day 14, day 28 and month 6 after the booster vaccination.	on day 14, day 28 and month 6 after the booster vaccination
GMT of neutralizing antibodies against P.1 virants on day 28 after the booster vaccination.	GMT of neutralizing antibodies against P.1 virants on day 28 after the booster vaccination.	on day 28 after the booster vaccination
GMT of neutralizing antibodies against 501Y.V2 virants on day 28 after the booster vaccination.	GMT of neutralizing antibodies against 501Y.V2 virants on day 28 after the booster vaccination.	on day 28 after the booster vaccination

Collaborators and Investigators

• Sponsor: Jiangsu Province Centers for Disease Control and Prevention
• Collaborators: CanSino Biologics Inc.

Publications and helpful links

General Publications

• Li J, Hou L, Guo X, Jin P, Wu S, Zhu J, Pan H, Wang X, Song Z, Wan J, Cui L, Li J, Chen Y, Wang X, Jin L, Liu J, Shi F, Xu X, Zhu T, Chen W, Zhu F. Heterologous AD5-nCOV plus CoronaVac versus homologous CoronaVac vaccination: a randomized phase 4 trial. Nat Med. 2022 Feb;28(2):401-409. doi: 10.1038/s41591-021-01677-z. Epub 2022 Jan 27.

Study record dates

Study Major Dates

• Study Start (Actual): May 25, 2021
• Primary Completion (Actual): July 25, 2021
• Study Completion (Actual): December 25, 2021

Study Registration Dates

• First Submitted: May 10, 2021
• First Submitted That Met QC Criteria: May 16, 2021
• First Posted (Actual): May 19, 2021

Study Record Updates

• Last Update Posted (Actual): March 31, 2022
• Last Update Submitted That Met QC Criteria: March 28, 2022
• Last Verified: March 1, 2022

More Information

Terms related to this study

• Keywords: SARS-CoV-2 Vaccine; Sequential immunization; Heterologous prime-boost; Ad5 vectored vaccine
• Additional Relevant MeSH Terms: Physiological Effects of Drugs; Immunologic Factors; Vaccines
• Other Study ID Numbers: JSVCT116

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No