evidence: Most people in the U.S. — about 80% — have gotten at least one dose of a COVID-19 vaccine, and they’ve been able to donate blood since the vaccines first became available, according to guidance from the Food and Drug Administration. [...] But anti-vaccine campaigners have recently focused on a claim that’s been lingering since the vaccines first became available — the unfounded idea that those who have not been vaccinated against COVID-19 have "clean blood" or "pure blood" and that it’s dangerous for them to receive a transfusion from someone who is vaccinated. The term "pure blood" has been embraced by at least one member of Congress, Rep. Marjorie Taylor Greene, who has a history of spreading vaccine misinformation. [...] Jacobs, Jeremy, et al. "Refusing blood transfusions from COVID‐19‐vaccinated donors: are we repeating history?" British Journal of Haematology. 15 Sep 2021.