There's no mechanism to integrate mRNA into the genome of the human body.
Actually, there is. The human genome is awash with retrotransposons that encode reverse transcriptase. Here is a preprint that convicinngly shows that SARS-Cov-2 RNA can be integrated into the human genome through reverse transcription via LINE-1 retrotransposons, and subsequently transcribed:
You said there is no mechanism. I pointed out that there is one. Note that you didn't say that there was a mechanism but there is no evidence it occurs, and now you're backtracking.
The lack of evidence you're referring to is because people like you assume it's not possible so don't bother looking, rather than people who have looked and not found it.
Actually, there is. The human genome is awash with retrotransposons that encode reverse transcriptase. Here is a preprint that convicinngly shows that SARS-Cov-2 RNA can be integrated into the human genome through reverse transcription via LINE-1 retrotransposons, and subsequently transcribed:
https://pubmed.ncbi.nlm.nih.gov/33330870/
There is no direct evidence the mRNA vaccines integrate by similar mechanisms, but it is clearly a distinct possiblity.
You said there is no mechanism. I pointed out that there is one. Note that you didn't say that there was a mechanism but there is no evidence it occurs, and now you're backtracking.
The lack of evidence you're referring to is because people like you assume it's not possible so don't bother looking, rather than people who have looked and not found it.