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Opinion: Urgent Need for Next-Generation COVID-19 Vaccines

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Simply updating the existing vaccine constructs with new variant sequences or even making trivalent or quadrivalent vaccines covering several variants is not likely to provide the depth and breadth of protection needed to interrupt viral transmission during a prolonged period. It is also not at all clear from well-controlled clinical trials that administering existing vaccines by the intranasal route (as some countries have already even approved) will provide truly meaningful benefit over the existing generation of COVID-19 vaccines.

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