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Saliva as a friend and foe in the fight against COVID-19. Saliva has a role in human-to-human transmission via bioaerosols and droplets. Salivary proteins and anti-SARS-CoV-2 antibodies, viral particles, EVs, and infected host cells can be potential diagnostic, prognostic, and COVID immunity monitoring biomarkers, for both symptomatic and asymptomatic patients. EVs: extracellular vesicles; ELISA: enzyme-linked immunosorbent assay.
