Indeed, and it is much more than mere weeks. It has long been known and demonstrated. According to the peer-reviewed study below from early 2025, published in Immunity, Inflammation and Disease, young adults who received a Pfizer COVID-19 vaccine showed elevated spike protein production a year or more after vaccination. Participants exhibited elevated levels of multiple proinflammatory cytokines – the proteins which help regulate the immune system – signifying a persistent immune response to the messenger RNA. Altered Circulating Cytokine Profile Among mRNA-Vaccinated Young Adults: A Year-Long Follow-Up Study https://onlinelibrary.wiley.com/doi/10.1002/iid3.70194
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