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Show Always some risk Recent advances have made the U.S. blood supply safer, but every transfusion still carries a risk of about one percent for some se- i rious infection, says the International Interna-tional Society of Blood Transfusion. Trans-fusion. A new test has been developed that screens for hepatitis C (which can cause chronic liver disease) but other problems remain: Plasma brought in from abroad and used in pharmaceutical supplies isn't fully screened for hepatitis C and some scientists even worry about the possibility of transmitting Lyme disease through blood. |