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I am by no means dismissing this achievement. But can anyone explain to me the advantages of this over the current COVID vaccines? Is it more effective?

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Lower dose (1/64 as much for same efficacy) and longer antigen expression (2+ weeks vs. 4 days).

https://pmc.ncbi.nlm.nih.gov/articles/PMC12031284/ explains the motivations and the challenges.

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