From our results, it is worth highlighting the large increase (7-fold) in the expression of the gene encoding the interferon-induced transmembrane (IFITM) protein 3 (IFITM3) in PBCs of patients with COVID-19, a gene upregulated soon after the infection of lung epithelial cells by SARS-CoV-2 [50]. The gene discussed is IFITM3; the disease is infection.