> Also, they must have solved the delivery mechanism somehow? RNA is notoriously unstable and doesn't usually make a suitable vaccine for that reason, although

> Also, they must have solved the delivery mechanism somehow? RNA is notoriously unstable and doesn't usually make a suitable vaccine for that reason, although recent mRNA vaccines have also solved this problem I guess. No, they rely on the instability to clear it out of your system so you're not creating spike proteins indefinitely. It's supposed to be temporary because the long-lasting part is what your body's immune system learns over that relatively short duration.