Section 610.41 - Donor deferral(a) You, an establishment that collects human blood or blood components, must defer donors testing reactive by a screening test for evidence of infection due to a relevant transfusion-transmitted infection(s) under § 610.40(a) , from future donations of human blood and blood components, except:(1) You are not required to defer a donor who tests reactive for anti-HBc or anti-HTLV, types I and II, on only one occasion. However, you must defer the donor if further testing for HBV or HTLV has been performed under § 610.40(e) and the donor is found to be positive, or if a second, licensed, cleared, or approved screening test for HBV or HTLV has been performed on the same donation under § 610.40(a) and is reactive, or if the donor tests reactive for anti-HBc or anti-HTLV, types I and II, on more than one occasion;(2) A deferred donor who tests reactive for evidence of infection due to a relevant transfusion-transmitted infection(s) under § 610.40(a) may serve as a donor for blood or blood components shipped or used under § 610.40(h)(2)(ii) ;(3) A deferred donor who showed evidence of infection due to hepatitis B surface antigen (HBsAg) when previously tested under § 610.40(a), (b), and (e) subsequently may donate Source Plasma for use in the preparation of Hepatitis B Immune Globulin (Human) provided the current donation tests nonreactive for HBsAg and the donor is otherwise determined to be eligible;(4) A deferred donor, who otherwise is determined to be eligible for donation and tests reactive for anti-HBc or for evidence of infection due to HTLV, types I and II, may serve as a donor of Source Plasma;(5) A deferred donor who tests reactive for a relevant transfusion-transmitted infections(s) under § 610.40(a) , may serve as an autologous donor under § 610.40(d) .(b) A deferred donor subsequently may be found to be eligible as a donor of blood or blood components by a requalification method or process found acceptable for such purposes by FDA. Such a donor is considered no longer deferred.(c) You must comply with the requirements under §§ 610.46 and 610.47 when a donor tests reactive by a screening test for HIV or HCV required under § 610.40(a) and (b) , or when you are aware of other reliable test results or information indicating evidence of HIV or HCV infection. 66 FR 31164 , June 11, 2001, as amended at 72 FR 48798 , Aug. 24, 2007; 80 FR 29897 , May 22, 2015