COVID-19(45) SARS-CoV-2(19) virus(18) coronavirus(17) risk(17) Result(16) pandemic(14) acute respiratory syndrome(12) management(12) exposure to(12) country(12) evaluate(11) effective(11) Health(11) Spread(11) COVID-19 pandemic(11) caused(11) group(11) Patient(11) death(11) COVID-19 patient(10) collected(10) acute respiratory syndrome coronavirus 2(9) lack(9) healthcare worker(9) severe acute respiratory syndrome Coronavirus(9) acute respiratory syndrome coronavirus(9) antibody(9) include(9) outcome(9)