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Nasal Vaccines Could Help Stop COVID-19 From Spreading—If Scientists Can Get Them Right

When SARS-CoV-2, the virus that causes COVID-19, infiltrates the body, it typically enters through the nose or mouth, then takes root and begins replicating. But what if it could never get a foothold in the upper airways and stopped by just inhaling a few drops of liquid or mist beforehand? That’s the idea behind nasal COVID-19 vaccines, which are meant to prevent infection by blocking the virus at its point of entry.

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