How nasal-spray vaccines could change the pandemic

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Are sprays the future of COVID-19 vaccines? That’s the hope of dozens of research groups and companies working on new kinds of inoculation. Rather than relying on injections, these use sprays or drops administered through the nose or mouth that aim to improve protection against the virus SARS-CoV-2. This week, an inhaled version of a COVID-19 vaccine, produced by the Chinese company CanSino Bi...

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