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To analyze the reentry situation of HBsAg single reagent reactive blood donors in Anhui province, and to verify the rationality and effectiveness of reentry strategy of blood donors in Anhui province. Shielded blood donors who were HBsAg single reagent reactive might voluntarily apply for returning to the team of blood donors after the shield of 6 months. Blood bankstaff that shielded those donors should draw blood and conduct screening tests. Samples from donors who were HBsAg negative should be delivered to Anhui Blood Center to conduct the reentr