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who heads the Public Health Service, said, "Although these false positive reactions may pose some inconvenience to blood donors and blood establishments, they represent no risk to the safety of the blood supply.
Two percent of the donors with false positive reactions stated that they had not received flu vaccines, and vaccination history of the remaining donors is not currently known.
FDA is working with screening kit and flu vaccine manufacturers to determine the reason for the false positive reactions and what can be done to overcome them.