COVID-19(89) SARS-CoV-2(68) coronavirus(36) pandemic(32) Patient(31) Infection(26) COVID-19 pandemic(23) SARS-CoV-2.(23) therapy(23) shown(23) Spike protein(22) develop(21) virus(21) coronavirus disease(20) RBD(20) disease(20) Coronavirus disease 2019(19) omicron(18) drug(18) Cytokine storm(18) Mutation(18) COVID-19 infection(17) Protein(17) ACE2(16) COVID-19 patients(16) caused(15) diagnostic(15) clinical trial(15) molecular(15) mechanism(15)