deltatrials
Completed PHASE2 INTERVENTIONAL 2-arm NCT04979949

Booster Vaccination Against COVID-19

Double-Blind, Randomized, Controlled, Multi-Centered, Phase 2 Clinical Trial to Determine the Safety, Efficacy, and Immunogenicity of Booster Vaccination Against SARS-CoV-2

Sponsor: Health Institutes of Turkey

Conditions COVID-19 Sars-CoV-2 Infection
Interventions CoronaVac Turkovac
Updated 10 times since 2021 Last updated: Nov 28, 2023 Started: Jul 12, 2021 Primary completion: Mar 9, 2022 Completion: Jun 6, 2022
This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

This PHASE2 trial investigates COVID-19 and Sars-CoV-2 Infection and is currently completed. Health Institutes of Turkey leads this study, which shows 10 recorded versions since 2021 — indicating substantial longitudinal coverage. Longitudinal tracking of infectious disease trials helps identify durability of treatment effects.

Status Flow

~Sep 2021 – ~Nov 2021 · 2 months · monthly snapshotRecruiting~Nov 2021 – ~Dec 2021 · 30 days · monthly snapshotRecruiting~Dec 2021 – ~Apr 2022 · 4 months · monthly snapshotActive Not Recruiting~Apr 2022 – ~May 2022 · 30 days · monthly snapshotActive Not Recruiting~May 2022 – ~Mar 2023 · 10 months · monthly snapshotActive Not Recruiting~Mar 2023 – ~Dec 2023 · 9 months · monthly snapshotCompleted~Dec 2023 – ~Jul 2024 · 7 months · monthly snapshotCompleted~Jul 2024 – ~Sep 2024 · 2 months · monthly snapshotCompleted~Sep 2024 – ~Sep 2025 · 12 months · monthly snapshotCompleted~Sep 2025 – present · 10 months · monthly snapshotCompleted

Change History

10 versions recorded

  1. Sep 2025 — Present [monthly]

    Completed PHASE2

  2. Sep 2024 — Sep 2025 [monthly]

    Completed PHASE2

  3. Jul 2024 — Sep 2024 [monthly]

    Completed PHASE2

  4. Dec 2023 — Jul 2024 [monthly]

    Completed PHASE2

  5. Mar 2023 — Dec 2023 [monthly]

    Completed PHASE2

    Status: Active Not Recruiting → Completed

▶ Show 5 earlier versions

  1. May 2022 — Mar 2023 [monthly]

    Active Not Recruiting PHASE2

  2. Apr 2022 — May 2022 [monthly]

    Active Not Recruiting PHASE2

  3. Dec 2021 — Apr 2022 [monthly]

    Active Not Recruiting PHASE2

    Status: Recruiting → Active Not Recruiting

  4. Nov 2021 — Dec 2021 [monthly]

    Recruiting PHASE2

  5. Sep 2021 — Nov 2021 [monthly]

    Recruiting PHASE2

    First recorded

Jul 2021

Trial started

Per CT.gov start date — pre-dates our first snapshot

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:
  • Health Institutes of Turkey
Data source: Health Institutes of Turkey

For direct contact, visit the study record on ClinicalTrials.gov .

Study Locations