Residual SARS-CoV-2 Presence in the Respiratory Tract and Lung Parenchyma (After SARS-CoV-2 Infection or COVID-19)

The investigators will collect residuary lung tissue after medically indicated pulmonary resections at the Thoracic Surgery Department of University Hospitals Leuven. More specifically the investigators will collect lung tissue from patients that had earlier PCR proven COVID-19 and/or serum anti-SARS-CoV-2 antibodies. Furthermore, for negative control of the methodology the investigators will also collect lung tissue from patients that have no signs for earlier SARS-CoV-2 infection.