COVID-19(47) SARS-CoV-2(31) Patient(31) Infection(21) with COVID-19(13) diagnosed(11) hospitalized patient(11) clinical(11) Hospitalization(11) Treatment(10) predict(10) intensive care unit(10) serum(10) association(10) COVID-19 infection(10) management(9) antibody(9) acute respiratory syndrome(9) Effect(9) polymerase chain(9) symptomatic(9) coronavirus(9) COVID-19 disease(8) Immunoglobulin(8) pandemic(8) herpes zoster(8) IgG(8) respiratory(8) patients(8) COVID-19 patient(7)