COVID-19(13) SARS-CoV-2(11) approach(6) risk(5) global healthcare(5) sensitivity(5) predicted(5) clinical(5) COVID-19 infected patient(5) change(5) Label-free(5) Mutation(5) healthy control(5) diagnostic(5) diagnostics(5) limit(5) Accuracy(5) subjects(5) genetic diversity(5) surface enhanced Raman spectroscopy(5) Classifier(5) Stage(5) artificial intelligence(5) virus(5) virus spike protein(5) specificity(5) healthy(5) management(5) scattering(5) false-negative(5)