There's a ton of stupidity in the comment base here.
I suppose we're talking about mRNA vaccines. Not all of the COVID vaccines are based on mRNA.
mRNA doesn't last in the body forever, it isn't specially engineered to last forever, and it doesn't affect the DNA in the body.
mRNA does last for quite a while, steadily being consumed with a bit of it potentially lasting months. Once it's been incorporated into cells it can't be artificially removed or degraded and will continue producing the antigen. If your body has problems handling the antigen you'll have to be immune-suppressed until the production has mostly ceased. That's a problem.
Once mRNA has been incorporated into cells it can't be artificially removed or degraded and will continue producing the antigen
I thought it was just bits that get into cells, gets used, then discarded, as viruses do to get their parts made.
No, each strand of mRNA is run through ribosomes multiple times, generating multiple copies of the protein it codes for, until it's cleaned up.
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