Investigating leftover SARS-CoV-2 in the lungs after COVID-19 infection

Residual SARS-CoV-2 Presence in the Respiratory Tract and Lung Parenchyma

Observational Universitaire Ziekenhuizen KU Leuven · NCT04775134

This study is trying to see if leftover SARS-CoV-2 is still present and active in the lungs of people who have recovered from COVID-19 by examining lung tissue samples.

Quick facts

Study typeObservational
Enrollment75 (estimated)
Ages18 Years and up
SexAll
SponsorUniversitaire Ziekenhuizen KU Leuven Academic / other
Locations1 site (Leuven)
Trial IDNCT04775134 on ClinicalTrials.gov

What this trial studies

This observational study aims to confirm or rule out the presence and viability of SARS-CoV-2 in the respiratory tract and lung tissue of patients who have previously been infected with the virus. Researchers will collect lung tissue samples from patients undergoing medically necessary pulmonary resections and analyze them using reverse transcriptase-polymerase chain reaction (PCR) and viral culture techniques. Additionally, the study will utilize fluorescence immunohistochemistry and single molecule fluorescence in situ hybridization to identify the location of any residual virus. Control samples will be taken from patients without prior SARS-CoV-2 infection to validate the findings.

Who should consider this trial

Good fit: Ideal candidates are patients requiring pulmonary resection who have a history of PCR-confirmed COVID-19 or positive serum anti-SARS-CoV-2 antibodies.

Not a fit: Patients currently experiencing active SARS-CoV-2 infection or those unable to provide informed consent will not benefit from this study.

Why it matters

Potential benefit: If successful, this study could enhance understanding of long-term effects of COVID-19 and inform treatment strategies for patients with lingering symptoms.

How similar studies have performed: While studies on residual viral presence post-infection are ongoing, this specific approach focusing on lung tissue viability is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Patient requires medically indicated pulmonary resection
* Informed consent

Exclusion Criteria:

* Active SARS-CoV-2 infection/COVID-19
* No informed consent

Where this trial is running

Leuven

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 Covid19
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.