Testing for COVID-19 antibodies among UZ Brussel employees after vaccination

SARS-COV-2 Seroprevalence and Seroconversion Among Employees of the Universitair Ziekenhuis Brussel Following COVID-19 Vaccination Using an Adenoviral Vector

Not applicable Interventional Universitair Ziekenhuis Brussel · NCT04939402

This study is testing how well the COVID-19 vaccine works in creating antibodies among UZ Brussel employees who have been vaccinated.

Quick facts

PhaseNot applicable
Study typeInterventional
Enrollment200 (estimated)
Ages18 Years and up
SexAll
SponsorUniversitair Ziekenhuis Brussel Academic / other
Locations1 site (Brussels)
Trial IDNCT04939402 on ClinicalTrials.gov

What this trial studies

This study investigates the seroprevalence and seroconversion of SARS-CoV-2 antibodies among employees of UZ Brussel who received the ChAdOx1 nCoV-19 vaccine. Employees presenting symptoms suggestive of COVID-19 will undergo real-time PCR testing, and serological tests will be performed to assess antibody levels. The study aims to determine the effectiveness of the vaccine in generating an immune response and its potential role in protecting against reinfection. The findings could provide valuable insights into the vaccine's efficacy among healthcare workers.

Who should consider this trial

Good fit: Ideal candidates for this study are adult employees of UZ Brussel who received the ChAdOx1 nCoV-19 vaccine during the specified period.

Not a fit: Patients who are not active employees of UZ Brussel during the inclusion period will not benefit from this study.

Why it matters

Potential benefit: If successful, this study could enhance understanding of vaccine-induced immunity and inform future vaccination strategies.

How similar studies have performed: Other studies have shown success in assessing serological responses to COVID-19 vaccines, indicating that this approach is supported by existing research.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Any adult employee of the UZ Brussel at T1 who has been vaccinated at the UZ Brussel with ChAdOx1 nCoV-19 vaccine between the 2nd of March and the 9th of March 2021 after participating to phase 4 of the COVEMUZ study between the 25th of January and the 12th of February and has provided a signed informed consent.

Exclusion Criteria:

* UZ Brussel employees not active during the inclusion period (T1).

Where this trial is running

Brussels

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions SARS-CoV-2Covid19
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.