NCT07585370 Long-term Effectiveness of the Live Attenuated Herpes Zoster Vaccine
| NCT ID | NCT07585370 |
| Status | Recruiting |
| Phase | — |
| Sponsor | Jiangsu Province Centers for Disease Control and Prevention |
| Condition | Herpes Zoster |
| Study Type | OBSERVATIONAL |
| Enrollment | 24,740 participants |
| Start Date | 2026-03-06 |
| Primary Completion | 2026-06-30 |
Eligibility & Interventions
Eligibility Fast-Check
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What to Expect as a Participant
This is an observational study. You will not receive an experimental treatment; researchers will collect data based on your existing condition or standard treatment.
This trial targets 24,740 participants in total. It began in 2026-03-06 with a primary completion date of 2026-06-30.
⚠ This information is for research awareness only. Always consult your physician before joining any clinical trial. Participation is voluntary and you may withdraw at any time.
Brief Summary
This is a multicenter retrospective cohort study to evaluate the long-term effectiveness of the live attenuated herpes zoster vaccine within 6 years after vaccination. We plan to select 24,740 participants who were non-herpes zoster cases in the modified Full Analysis Set for Efficacy (E-mFAS) from the Phase III Clinical Trial (NCT04334577) of the live attenuated herpes zoster vaccine manufactured by Changchun BCHT Biotechnology Co. conducted during 2020-2021. In the original Phase III Clinical Trial, the participants were randomly assigned to the vaccine group and the placebo group at a 1:1 ratio to receive one dose of the live attenuated herpes zoster vaccine (with varicella-zoster virus \>=4.3 lg PFU per 0.5 mL dose) or one dose of placebo (with no varicella-zoster virus component), respectively. This study uses a stage-based design. In Stage 1, participants originally assigned to the vaccine group and those originally assigned to the placebo group will be compared to assess the cumulative incidence of herpes zoster from the end of the original Phase III Clinical Trial in July 2021 to the marketing authorization of the vaccine in China in June 2023. In Stage 2, after marketing authorization of the vaccine in China in June 2023, a large proportion of the participants originally assigned to the placebo group received catch-up vaccination and thereby formed a catch-up vaccination group. These stage-specific groups will be compared to evaluate the relative waning of protection in participants who received catch-up vaccination compared with participants vaccinated in the original Phase III Clinical Trial. In addition, among participants originally assigned to the placebo group who received catch-up vaccination, the incidence of herpes zoster during the post-catch-up vaccination period will be compared with the incidence during their earlier placebo period before catch-up vaccination, in order to evaluate the relative risk of herpes zoster under vaccinated versus placebo exposure. For this study, telephone surveys will be conducted using a standardized questionnaire to collect data on herpes zoster occurrence from participants, with verbal informed consent obtained prior to the survey. Face-to-face interviews will also be conducted to verify reported herpes zoster cases. Moreover, their past medical history and lifestyle information will be collected.
Eligibility Criteria
Inclusion Criteria: 1. Individuals included in the E-mFAS from the Phase III Clinical Trial (NCT04334577) of the live attenuated herpes zoster vaccine produced by Changchun BCHT biotechnology Co. conducted during 2020-2021. 2. Individuals who were able to complete the study with verbal informed consent. Exclusion Criteria: 1. Individuals who developed herpes zoster during the original Phase III Clinical Trial follow-up period. 2. Individuals who were known to have died before the retrospective study.
Contact & Investigator
Pengfei Jin
PRINCIPAL INVESTIGATOR
Jiangsu Provincial Center for Diseases Control and Prevention (Jiangsu Provincial Academy of Preventive Medicine)
Frequently Asked Questions
Who can join the NCT07585370 clinical trial?
This trial is open to participants of all sexes, aged 40 Years or older, studying Herpes Zoster. Full inclusion and exclusion criteria are listed in the Eligibility Criteria section. Always confirm your eligibility with the research team before applying.
Is NCT07585370 currently recruiting?
Yes, NCT07585370 is actively recruiting participants. Contact the research team at jpf19891103@163.com for enrollment information.
Where is the NCT07585370 trial being conducted?
This trial is being conducted at Nanjing, China.
Who is sponsoring the NCT07585370 clinical trial?
NCT07585370 is sponsored by Jiangsu Province Centers for Disease Control and Prevention. The principal investigator is Pengfei Jin at Jiangsu Provincial Center for Diseases Control and Prevention (Jiangsu Provincial Academy of Preventive Medicine). The trial plans to enroll 24,740 participants.