COVID-19(8) Chickenpox(3) SARS-CoV-2(3) Interferon-gamma(3) cellular immunity(3) vaccination.(3) Hepatitis B virus (HBV)(3) Varicella-zoster virus.(3) Hepatocellular carcinoma(3) Immunosuppressive agents(3) exosomal microRNA(2) immunoregulation(2) Methylation(2) Infection(2) Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).(2) Exosomes(2) body mass index(1) Coronavirus disease 2019(1) Peripheral blood mononuclear cells(1) China(1) alteplase(1) UBE2Q1(1) hepatocellular carcinoma (HCC)(1) Atypical lymphocyte(1) Hepatitis B virus(1) prone position ventilation.(1) delta variant(1) cyclin D2(1) Deletion(1) Perimyocarditis(1)