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Study on Sequential Immunization of Inactivated COVID-19 Vaccine and Recombinant COVID-19 Vaccine (Ad5 Vector) in Elderly Adults

NCT04952727 · Status: COMPLETED · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 300

Last updated 2022-08-16

No results posted yet for this study

Summary

This is a randomized, observer-blind, parallel-controlled study, for evaluation of safety and immunogenicity of sequential immunization of a recombinant COVID-19 vaccine (adenovirus type 5 vector) in Chinese healthy adults aged 60 and above after the priming vaccination of inactivated vaccine. 300 healthy subjects aged 60 and above 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.

Conditions

Interventions

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.

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.

Sponsors & Collaborators

  • CanSino Biologics Inc.

    collaborator INDUSTRY

  • Jiangsu Province Centers for Disease Control and Prevention

    lead NETWORK

Principal Investigators

  • Jing-Xin Li, PhD · Jiangsu Provincial Center for Diseases Control and Prevention

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
TRIPLE
Model
PARALLEL

Eligibility

Min Age
60 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2021-08-26
Primary Completion
2021-11-26
Completion
2022-05-15

Countries

  • China

Study Locations

More Related Trials

Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04952727 on ClinicalTrials.gov