14 minute video
https://www.youtube.com/watch?v=aU7uBmLUiiY
Overall, more than 90% of current blood donors have either been infected with covid or vaccinated against it, said Dr. Michael Busch, director of the Vitalant Research Institute, who is monitoring antibody levels in samples from the U.S. blood supply.
Less than 10% of the blood we collect does not have antibodies, Busch noted.
https://archive.is/9gSTQ#selection-671.256-671.501
Easy....