There are readily available antibody tests that help determine if the human body has been exposed to the Sars-CoV-2 virus or exposed to a vaccine that generates antibodies to a subset of the actual virus (CDC Serology Testing). Based on many published scientific works having segregated antibodies from disease versus vaccines, it also appears feasible to determine if the body shows a reaction to the full virus, or a subset of the virus (reaction to a vaccine). This latter test is likely not readily available, but instead, available to medical researchers.
The above serology testing is based on detecting antibodies with specific properties that indicate their origin. The question I have is about having tissue samples tested, as opposed to blood or serum.
Is it feasible to have a tissue sample (a "biopsy") analyzed to check for the presence of Sars-CoV-2 spike protein? These proteins, produced by the human cellular machinery upon introduction of vaccine vector or by the disease itself are thought to be destroyed over time. To validate the speed and completeness of this destruction, is there a protocol to test a sample to ascertain the level of these proteins? If so, what researchers are doing this work?
Edit to add: The purpose of the test would be to validate the claim that the proteins generated by the vaccines do not persist in the human body.