This could easily be tested. Obtain N samples of vaccinated and unvaccinated blood, label and randomize. Prepare without knowing which is which. Then compare all blood and see if anyone can match the results. But that would be science anathema to “functional” quacks. Even though such a study, if confirmed, would bring lots of business to these blood charlatans.
Given the clustering of jab symptoms among lots associated with specific locales, you’d have to control for that as well.