The United States instituted universal screening in 1992 decreasing the risk from one in 200 units of blood to one in 10,000 to one in 10,000,000 per unit of blood.
The United States instituted universal screening in 1992 in 200 units of blood to one in 10,000 to one in 10,000,000 per unit of blood. The United States were decreasing the risk from one in 200 units of blood to one in 10,000 to one in 10,000,000 per unit of blood.