[Jamestown1630]

There have been some strange stories about people who have had organ transplants - I don’t know how true any of them are.

But again, the OP seems to express Covid vaccination as a main concern. I think there are concerns I’d put ahead of that.

[wildcard_redneck]

Transplant patient finds out his DNA has been replaced by that of his donor
A man who had a bone marrow transplant to treat acute myeloid leukemia later found out that the DNA in his blood and semen had been replaced by that of his donor.
https://www.news-medical.net/news/20191210/Transplant-patient-finds-out-his-DNA-has-been-replaced-by-that-of-his-donor.aspx