but they are like any other vaccine or illness in that it simply provides an example of what to fight so your body then has a heads-up for the real battle in the future. the fragments of rna are then destroyed by your body as soon as it finds them.
this is the future of modern medicine. it may seem a bit scary now because it's new, but it'll become the norm soon enough. there's a whole plethora of viruses out there that are about to feel the wrath of good ol' human brain power as we wipe them off the face of the earth.