Post Vaccination Syndrome (PVS) preprint published by Yale University
A preprint study from Yale University appears to identify individuals suffering from PVS with elevated levels of circulating isolated spike protein, compared to healthy controls, implying that the source is from a vaccine. Those studied had no prior history or evidence of a SARS-Cov2 infection.
Researchers have since publication pointed out that Long Covid existed significantly before vaccines were available, defending suggestions from some that Long Covid had somehow been caused purely as a result of vaccination. This is not the case, and PVS forms a very small subset of those suffering with Long Covid Symptoms.