How does this work? It sounds like its not a vaccine (your immune system is not invoked) but something that attaches to the spike protein and inhibits it from entering cells. But how could a nasal spray last a long time? Is this something that needs to be used continuously?
It just reduces the amount of virus which can reproduce in your nasal cavities, giving your innate immune response a better chance at fighting it off before it gains a foothold. I've mostly seen it recommended as something to do after significant exposure events like being among large crowds indoors.
