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Lyme disease is caused by a spirochete, Borrelia burgdorferi, and represents a potential transfusion hazard. Some Borrelia burgdorferi-infected blood donors may not be disqualified by standard donor selection procedures, thus possibly transmitting the
disease. In a follow-up of 14 recipients of blood products donated by such a donor, no clinical signs or serologic evidence of a transfusion-transmitted borreliosis could be demonstrated.