From the original study though, patients without myocarditis were found to have no such levels. > A notable finding was that markedly elevated levels of full-l

From the original study though, patients without myocarditis were found to have no such levels. > A notable finding was that markedly elevated levels of full-length spike protein (33.9±22.4 pg/mL), unbound by antibodies, were detected in the plasma of individuals with postvaccine myocarditis, whereas no free spike was detected in asymptomatic vaccinated control subjects (unpaired t test; P<0.0001). So what we have is a potential explanatory mechanism (namely, probably some biochemistry which means for whatever reason these people seem to release the protein rather then keep it cell bound - although correlation is not causation, the whole effect could work the other round). [1] https://pubmed.ncbi.nlm.nih.gov/36597886/ https://pubmed.ncbi.nlm.nih.gov/36597886/