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I am sorry this thread got hijacked. I had the same thought as the OP: vaccines work by training the bodies own defences. The description of this spray sounds more like a disinfectant that prevents the virus from binding to human cells. Can anyone knowledgeable on HN clarify this?

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The mucosal immune system in the respiratory tract is the first line of defense against covid. An interstitial injection does not train the mucosal immune system, while a nasal vaccine does. To prevent any infection, the mucosal immune system needs to be primed.

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