Scientists in a new paper detected spike protein in the bloodstream of people with long COVID two months after infection and COVID-19 vaccination, suggesting that spike protein may persist in the body much longer than previously predicted and does not remain at the injection site.

https://www.zerohedge.com/covid-19/scientists-detect-spike-protein-covid-vaccination-long-covid-patients

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Presence of viral spike protein and vaccinal spike protein in the blood serum of patients with long-COVID syndrome

https://www.europeanreview.org/wp/wp-content/uploads/013-019-2.pdf