COVID-19(25) SARS-CoV-2(20) pandemic(13) Spread(11) virus(10) coronavirus(9) Result(8) Vaccine(8) Patient(7) Treatment(7) COVID-19 pandemic(7) reported(7) measure(7) death(6) effective(6) highlight(6) outbreak(6) Research(6) Transmission(5) Infection(5) approach(5) acute respiratory syndrome(5) vaccination(4) required(4) caused(4) Health(4) Abstract(4) Government(4) viral infection(4) Vaccines(4)