COVID-19(9) reduce(6) tested(6) coronavirus(6) SARS-CoV-2(6) acute respiratory syndrome(6) Nanotechnology(5) Abstract(4) oral swabs(3) caused(3) Vaccines(3) Prophylactic(3) silver nanoparticle(3) interfere(3) pandemic(3) Engineering(3) demonstrated(3) LDH(3) two-dimensional(3) Epidemic(3) platform(3) M pro(3) inhaler(3) 2D nanomaterials(3) ACE2(3) fibroblast(3) variety(3) diagnostic(3) kill(3) Protein(3)