An Immunity Persistence Study of Live Attenuated Varicella Vaccine

January 23, 2025 updated by: Sinovac (Dalian) Vaccine Technology Co., Ltd.

An Open Clinical Trial to Evaluate the Immunity Persistence of Live Attenuated Varicella Vaccine At 5 and 8 Years After Primary Immunization with Live Attenuated Varicella Vaccine

This an open phase Ⅳ clinical trial of live attenuated varicella vaccines manufactured by Sinovac (Dalian) Vaccine Technology Co., Ltd .The purpose of this study is to evaluate the immunity persistence of live attenuated varicella vaccine at 5 and 8 years after primary immunization with live attenuated varicella vaccine.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Enrolling by invitation

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This study is an open phase Ⅳ clinical trial in subjects who enrolled in the clinical trial and included in the immunogenicity subgroup PPS set from August to September 2016 .The experimental vaccine and placebo (Freeze Dired Dilution) were manufactured by Sinovac (Dalian) Vaccine Technology Co., Ltd.A total of 703 subjects will be enrolled including 349 subjects in experimental group and 354 subjects in control group .And 3.0-3.5ml of venous blood was collected from all subjects at 5 and 8 years after primary immunization, and the serum was separated for varicella antibody detection. The window period of blood collection was six months.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
703

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
    • Henan
      • Xuchang, Henan, China, 461700
        • Xiangcheng County Center for Disease Control and Prevention
      • Zhumadian, Henan, China, 463700
        • Biyang County Center for Disease Control and Prevention

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

1 year to 17 years (Child)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Subjects in PPS immunogenicity subgroup of phase Ⅲ clinical trial of protective effect of varicella vaccine;
  • The subject and/or guardian can understand and voluntarily sign the informed consent form;
  • Proven legal identity.

Exclusion Criteria:

  • History of chickenpox or shingles;
  • History of varicella vaccination since phase Ⅲ clinical trial;
  • Autoimmune disease or immunodeficiency / immunosuppression;
  • History of immunosuppressive therapy since phase Ⅲ clinical trial;
  • According to the investigator's judgment, the subject has any other factors that are not suitable for participating in the clinical trial.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Experimental Group
349 subjects who enrolled in the experimental group of clinical trial and included in the immunogenicity subgroup PPS set from August to September 2016 will be collected venous blood 3.0~3.5ml at 5 and 8 years after primary immunization.
Biological: Investigational Live Attenuated Varicella Vaccine
The live attenuated varicella vaccine was manufactured by Sinovac (Dalian) Vaccine Technology Co., Ltd. Live attenuated varicella-virus in 0·5 mL injection water with sucrose,sodium glutamate,sodium chloride,potassium chloride, sodium dihydrogen phosphate, potassium dihydrogen phosphate per injection.
Placebo Comparator: Control Group
354 subjects who enrolled in the control group of clinical trial and included in the immunogenicity subgroup PPS set from August to September 2016 will be collected venous blood 3.0~3.5ml at 5 and 8 years after primary immunization.
Biological: Placebo (Freeze Dired Dilution)
The placebo (freeze dired dilution) was manufactured by Sinovac (Dalian) Vaccine Technology Co., Ltd. and contained no active ingredient.It was 0·5 mL injection water with sucrose,sodium glutamate,sodium chloride,potassium chloride and phosphate.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Immunogenicity index-seropositive rates of varicella antibody
Time Frame: 5 years after primary immunization
The seropositive rates of varicella antibody in 5 years after primary immunization with varicella vaccine
5 years after primary immunization
Immunogenicity index-GMT of varicella antibody
Time Frame: 5 years after primary immunization
GMT of varicella antibody in 5 years after primary immunization with varicella vaccine
5 years after primary immunization
Immunogenicity index-the seropositive rates of varicella antibody
Time Frame: 8 years after primary immunization
The seropositive rates of varicella antibody in 8 years after primary immunization with varicella vaccine
8 years after primary immunization
Immunogenicity index-the GMT of varicella antibody
Time Frame: 8 years after primary immunization
GMT of varicella antibody in 8 years after primary immunization with varicella
8 years after primary immunization

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Sinovac (Dalian) Vaccine Technology Co., Ltd.

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Lili Huang, Bachelor, Henan Provincial Center for Disease Prevention and Control

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 18, 2021

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 19, 2021

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
October 1, 2025

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 14, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 14, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 27, 2021

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 25, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 23, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • PRO-VZV-4004

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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