COVID-19(484) SARS-CoV-2(458) Infection(195) coronavirus(179) SARS-COV-2 infection(166) acute respiratory syndrome(134) Cell(133) mechanism(130) disease(125) virus(123) Inflammation(114) Protein(114) Patient(107) caused(106) immune response(106) Treatment(103) respiratory(101) pathway(100) coronavirus disease(97) ACE2(96) pandemic(91) Viral(89) expression(86) Vaccine(86) involved(75) COVID-19 patients(73) role(72) death(69) Effect(68) Spike protein(68)