COVID-19(17) SARS-CoV-2(16) COVID-19 patient(6) receptor(6) Activation(6) IFN-γ(6) Genes(6) CD8(5) naïve(5) response(5) Patient(5) Cytokine storm(4) Vaccine(4) functional(3) severe complication(3) ARDS(3) binding(3) coronavirus(3) T cells(3) Transcription(3) NKG2D(3) SARS-CoV-2 spike glycoprotein(3) Vitamin D receptor(3) modulation(3) COVID-19 patients(3) innate immune cell(3) memory T cell(3) helper T cells(3) effector(3) Effect(3)