# A Trial Among HealthCare Workers (HCW) Vaccinated With Janssen Vaccine: the SWITCH Trial

> **NCT04927936** · NA · UNKNOWN · sponsor: **Erasmus Medical Center** · enrollment: 432 (estimated)

## Conditions studied

- Covid19

## Interventions

- **BIOLOGICAL:** Vaccination once with Janssen vaccine (only priming)
- **BIOLOGICAL:** Vaccination with Janssen vaccine followed with Janssen vaccine (homologous boosting).
- **BIOLOGICAL:** Vaccination with Janssen vaccine followed with Moderna vaccine (heterologous boosting).
- **BIOLOGICAL:** Vaccination with Janssen vaccine followed with Pfizer vaccine (heterologous boosting).

## Key facts

- **NCT ID:** NCT04927936
- **Lead sponsor:** Erasmus Medical Center
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** UNKNOWN
- **Start date:** 2021-06-25
- **Primary completion:** 2022-09
- **Final completion:** 2022-09
- **Target enrollment:** 432 (ESTIMATED)
- **Last updated:** 2021-06-30

## Collaborators

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- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04927936

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04927936, "A Trial Among HealthCare Workers (HCW) Vaccinated With Janssen Vaccine: the SWITCH Trial". Retrieved via AI Analytics 2026-06-03 from https://api.ai-analytics.org/clinical/NCT04927936. Licensed CC0.

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