# Trial of 2nd Booster Dose of COVID-19 Vaccine

> **NCT05539703** · NA · WITHDRAWN · sponsor: **Norwegian Institute of Public Health**

## Conditions studied

- COVID-19

## Interventions

- **OTHER:** Invitation to get a 2nd booster dose of COVID-19 vaccine

## Key facts

- **NCT ID:** NCT05539703
- **Lead sponsor:** Norwegian Institute of Public Health
- **Sponsor class:** OTHER_GOV
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** WITHDRAWN
- **Start date:** 2022-10
- **Primary completion:** 2023-01
- **Final completion:** 2023-06
- **Target enrollment:** 0 (ACTUAL)
- **Why stopped:** Did not get the necessary approvals in time.
- **Last updated:** 2025-05-29


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05539703

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05539703, "Trial of 2nd Booster Dose of COVID-19 Vaccine". Retrieved via AI Analytics 2026-07-30 from https://api.ai-analytics.org/clinical/NCT05539703. Licensed CC0.

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