Pfizer is now admitting to including mRNA in the flu and Shingles vaccines. Also they admit to working on saRNA which may result in RNA vaccines permanently replicating in your body.
As the global population ages, there is a need for highly effective, well tolerated, and efficiently-produced shingles vaccines which Pfizer and BioNTech aim to address by utilizing mRNA technology
Pfizer
More here: https://open.substack.com/pub/tomrenz/p/arguments-for-halting-covid-19-vaccines