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Sources of HLA Sensitization. Blood transfusionPrior transplantationPregnancyOthers? Among patients receiving their first kidney transplant with no known history of blood transfusions, approximately 20% of nulliparous women and 13% of men were sensitized (PRA>10%). ?unreported or unrecognized pregnancies or transfusions, ?antigenic stimulation of sperm. ?cross-reacting environmental allergens.
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