# Third Dose of mRNA Vaccination to Boost COVID-19 Immunity (mBoost Study)

> **NCT05057182** · PHASE4 · COMPLETED · sponsor: **The University of Hong Kong** · enrollment: 300 (actual)

## Conditions studied

- COVID 19 Vaccine

## Interventions

- **BIOLOGICAL:** BNT162b2

## Key facts

- **NCT ID:** NCT05057182
- **Lead sponsor:** The University of Hong Kong
- **Sponsor class:** OTHER
- **Phase:** PHASE4
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2021-10-18
- **Primary completion:** 2024-03-31
- **Final completion:** 2024-12-31
- **Target enrollment:** 300 (ACTUAL)
- **Last updated:** 2026-05-15


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05057182

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05057182, "Third Dose of mRNA Vaccination to Boost COVID-19 Immunity (mBoost Study)". Retrieved via AI Analytics 2026-06-24 from https://api.ai-analytics.org/clinical/NCT05057182. Licensed CC0.

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