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A retrospective study was done on blood units collected from replacement and voluntary donors from 2001 to 2007. Seropositivity of transfusion transmitted disease in replacement donors was 1.96% in hepatitis B surface antigen, 0.85% in hepatitis C virus, 0.23% in HIV and 0.01% in syphilis. Voluntary donors had an almost negligible infectivity rate.
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Chandra et al. (2009) studied this question.
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